工具方法
滚动到元素顶部
document.querySelector(el).scrollTo(0, 0)
获取协议
const protocol = window.location.protocol
将table导出为xlsx
import FileSaver from 'file-saver' import XLSX from 'xlsx' // /* generate workbook object from table */ // // 转换成excel时，使用原始的格式 let xlsxParam = {raw: true}; // el-table的fixed属性来让某一列固定，但elementui的实现方式是：创建了两个tabledom，通过一个隐藏一个显示来实现交互效果。 // 当导出整个el-table 就会将两个div内的table都导出，导致数据重复。移除重复table let fix = document.querySelector('.el-table__fixed'); let wb; if (fix) { wb = XLSX.utils.table_to_book(document.querySelector('.el-table').removeChild(fix), xlsxParam); document.querySelector('.el-table').appendChild(fix); } else { wb = XLSX.utils.table_to_book(document.querySelector('.el-table'), xlsxParam); } /* get binary string as output */ let wbout = XLSX.write(wb, {bookType: 'xlsx', bookSST: true, type: 'array'}); try { FileSaver.saveAs(new Blob([wbout], {type: 'application/octet-stream'}), '差评查询-' + (moment(new Date()).format('YYYYMMDD')) + '.xlsx'); } catch (e) { if (typeof console !== 'undefined') { console.log(e, wbout) } } finally { this.isExport = false; this.pageSize = pageSize } return wbout;
数组对象去重
// 数组对象去重 let hash = {}; this.targetList = this.targetList.reduce(function (item, next) { hash[next.name] ? '' : hash[next.name] = true && item.push(next); return item }, [])
数组拼接
let arr = [1, 2];
arr.push(...[3, 4]);
正则方法
let re = /\/p\/(.*?).html/ let str = 'https://wwww.badu.com/p/121212.html' // 121212 console.log(str.match(re)[1]) // 121212 console.log(re.exec(str)[1]) // true console.log(re.test(str)) // 匹配到的起始位置 -1为没匹配到 console.log(str.search(re)) // 替换 console.log(str.replace(re, '/p/686868.html'))
千分位格式化
format(num) { // let reg = /(\d)(?=(\d{3})+(?!\d))/g let reg = /\d{1,3}(?=(\d{3})+$)/g return (num + '').replace(reg, '$&,') }
使用过滤器
// 百分百公共方法 Vue.filter('toPercent', function (val) { return (val * 100).toFixed(2) + '%' }); // 千分位公共方法 Vue.filter('thousands', function (val) { // let reg = /(\d)(?=(\d{3})+(?!\d))/g let reg = /(\d{1,3})(?=(\d{3})+(?:$|\.))/g;
let result = (val + '').replace(reg, '$&,'); return result });
页面上
{{ 0.33333 | toPercent() }}
{{ 9999999 | thousands() }}
其他
// echarts重绘 reDraw(id) { document.getElementById(id).removeAttribute('_echarts_instance_') }, // 只能输入整数和小数 AllowDigitalDecimal(val) { let reg = /^\d+(\.\d{0,2})?$/g if (reg.test(val)) { return false } else { return true } }, // 只能输入数字 AllowDigital(val) { let reg = /[^\d]/g; if (reg.test(val)) { this.$message({ message: '只能输入数字', type: 'warning' }); } let result = val.replace(reg, ''); return result }, // 不允许空格 NoSpacesAllowed(val) { let reg = /\s+/g; let result = val.replace(reg, ''); return result }, // 判断不能为空 IsEmpty(val) { let reg = /\s+/g; if (reg.test(val) || val === null || val.length === 0) { return false } else { return true } }, // 汉字长度限制为1-50个 Limit(val) { // 匹配中文，英文字母和数字及_ let reg = /^[\u4e00-\u9fa5_a-zA-Z0-9]{1,50}$/g; if (reg.test(val)) { return true } else { return false } }
路由跳转
// 字符串 this.$router.push('/home/first') // 对象 this.$router.push({ path: '/home/first' }) // 命名的路由 this.$router.push({ name: 'home', params: { userId: wise }}) // 点击事件里面写 this.$router.push({ name: 'distributesList', query: { ruleForm: this.ruleForm }})
router-link
查询字符串：
去哪里 ？ <router-link :to="{name:'detail',query:{id:1}}"> xxx </router-link> 导航（查询字符串path不用改） {name:'detail',path:'/detail',组件} 去了干嘛？获取路由参数（要注意是 query ，还是 params 和 对应的 id 名? 是后者需要注意设置相关文件的id规则） + this.$route.query.id
path方式：
去哪里 ？ <router-link :to="{name:'detail',params:{name:1}}"> xxx </router-link> 导航（查询字符串path不用改） {name:'detail',path:'/detail/:name',组件} 去了干嘛？获取路由参数（要注意是 query ，还是 params 和 对应的 name 名? 是后者需要注意设置相关文件的id规则） + this.$route.params.id
页面不刷新情况下修改url参数
window.history.pushState(data, title, targetURL);
@状态对象：传给目标路由的信息,可为空
@页面标题：目前所有浏览器都不支持,填空字符串即可
@可选url：目标url，不会检查url是否存在，且不能跨域。如不传该项,即给当前url添加data
window.history.replaceState(data, title, targetURL);
@类似于pushState,但是会直接替换掉当前url,而不会在history中留下记录
打开新窗口
<router-link tag="a" target="_blank" :to="{name:'searchGoods',params:{catId:0},query:{keywords:'手机'}}">热门好货</router-link>
let routeData = this.$router.resolve({ name: "searchGoods", query: params, params:{catId:params.catId} }); window.open(routeData.href, '_blank');
<a class="target" href="" target="_blank"></a>
let target = document.querySelector('.target')
target.setAttribute('href', window.location.origin + '/home/integral-record')
target.click()
json排序
desc (x,y) { return (x['index'] < y['index']) ? 1 : -1 }, asc(x, y) { return (x['index'] > y['index']) ? 1 : -1 },
let k = [
{
index: 13,
name: 'e'
},
{
index: 1,
name: 'a'
}
]
console.log(k.sort(this.asc))
字符串 to JSON
this.sign = eval('(' + res.data.data + ')') // 将json字符串转换成json对象 this.sign = JSON.parse(res.data.data); // 将json字符串转换成json对象 this.sign = JSON.stringify(res.data.data); // 将json对象转换成json对符串
对象是否为空
let objLength = Object.keys(val) if (objLength.length !== 0) { }
数组、字符串互转
var a, b; a = new Array(0,1,2,3,4); b = a.join("-"); //"0-1-2-3-4"
var s = "abc,abcd,aaa"; ss = s.split(",");// 在每个逗号(,)处进行分解 ["abc", "abcd", "aaa"] var s1 = "helloworld"; ss1 = s1.split(''); //["h", "e", "l", "l", "o", "w", "o", "r", "l", "d"]
一个子组件循环渲染
<div class="db" v-for="(item,index) in this.allData" :key="item.reviewType">
<router-link :to="{path:'/analysis/'+ item.reviewType}">
<div class="title">
{{item.reviewType}}
<i class="el-icon-arrow-right icon-right"></i>
</div>
</router-link>
<show-data :id="'show'+index" :trend="item.trend"></show-data>
</div>
子组件
<div :id="this.id" style="width: 96%;height: 220px;margin: 0 auto"></div>
数组大小比较方法
let one = Math.max.apply(null, arr1) let two = Math.max.apply(null, arr2) let max = Math.max(one, two) + Math.max(one, two) / 2
H5页面流畅滚动
#wrap ul { overflow-x: hidden; overflow-y: scroll; -webkit-overflow-scrolling: touch; }
滚动条样式
/*滚动条样式*/ ::-webkit-scrollbar { width: 8px; height: 8px; background-color: transparent; } ::-webkit-scrollbar-thumb { border-radius: 2px; background: rgba(0, 0, 0, .2); }
当月第一和最后一天
let now = new Date() //当前日期 let nowMonth = now.getMonth() //当前月 let nowYear = now.getFullYear() //当前年 //本月的开始时间 let monthStartDate = new Date(nowYear, nowMonth, 1) //本月的结束时间 let monthEndDate = new Date(nowYear, nowMonth + 1, 0) console.log('本月1号是' + new Date(monthStartDate)) console.log('本月最后一天是' + new Date(monthEndDate))
new Date(new Date().getFullYear(), new Date().getMonth() - 1, 1) // 上月1号
new Date(new Date().getFullYear(), new Date().getMonth(), 1) // 当前月1号
// 获得当前年份4位年 let currentYear = new Date().getFullYear(); // 本年第一天 let currentYearFirst = new Date(currentYear, 0, 1); // 本年最后一天 let currentYearLast = new Date(currentYear, 11, 31); // 本月第一天 let currentMonthFirst = new Date(new Date().getFullYear(), new Date().getMonth(), 1); // 本月最后一天 let currentMonthLast = new Date(new Date().getFullYear(), new Date().getMonth() + 1, 0); // 本周第一天 let weekFirst = new Date(new Date().getFullYear(), new Date().getMonth(), new Date().getDate() - new Date().getDay()) // 本周最后一天 let weekLast = new Date(new Date().getFullYear(), new Date().getMonth(), new Date().getDate() + (6 - new Date().getDay()))
获取星期几
var dt = new Date(year, month, date); var weekDay = ["星期天", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"]; console.log("打印数值---",dt.getDay()); console.log("今天是:",weekDay[dt.getDay()]);
获取自然月自然周等等
自然月起始、结束
getMonthBegin(year, month) { return new Date(year, month - 1, 1); }, getMonthEnd(year, month) { return new Date(year, month, 0); },
/** * 获取自然月开始结束时间 * @param {*} year * @param {*} month */ function getMonthBeginEnd(year, month) { if (~~year === 0 || ~~month === 0) { throw new Error('年月参数错误'); } const result = {begin: 0, end: 0}; const target = new Date(); target.setFullYear(year); target.setMonth(month - 1); target.setDate(1); target.setHours(0); target.setMinutes(0); target.setSeconds(0); target.setMilliseconds(0); result.begin = target.getTime(); const now = new Date(); if (target.getFullYear() + target.getMonth() >= now.getFullYear() + now.getMonth()) { result.end = now.getTime(); console.log(result); console.log(new Date(result.begin), new Date(result.end)); return result; } target.setMonth(month);//当月的下个月1日 0时0分0秒 target.setSeconds(-1);//前1秒,即昨天最后1秒钟,也就是上个月的最后一秒钟 result.end = target.getTime(); console.log(result); console.log(new Date(result.begin), new Date(result.end)); return result; } /** * 获取自然日开始结束时间 * @param {*} year * @param {*} month * @param {*} date */ function getDateBeginEnd(year, month, date) { if (~~year === 0 || ~~month === 0 || ~~date === 0) { throw new Error('年月日参数错误'); } const result = {begin: 0, end: 0}; const target = new Date(); target.setFullYear(year); target.setMonth(month - 1); target.setDate(date); target.setHours(0); target.setMinutes(0); target.setSeconds(0); target.setMilliseconds(0); result.begin = target.getTime(); const targetDateCount = target.getFullYear() + target.getMonth() + target.getDate(); const now = new Date(); const nowDateCount = now.getFullYear() + now.getMonth() + now.getDate(); if (targetDateCount >= nowDateCount) { result.end = now.getTime(); console.log(0, result); console.log(new Date(result.begin), new Date(result.end)); return result; } target.setDate(target.getDate() + 1);//次日0时0分0秒 target.setSeconds(-1);//前1秒,即当日最后1秒钟 result.end = target.getTime(); console.log(1, result); console.log(new Date(result.begin), new Date(result.end)); return result; } /** * 获取自然周开始结束时间 * @param {*} year * @param {*} month * @param {*} number 第几周 */ function getWeekByMonth(year, month, number) { const weekCount = getWeekCountInMonth(year, month); const result = {begin: 0, end: 0, list: weekCount}; const target = new Date(); target.setFullYear(year); target.setMonth(month - 1); target.setDate(1); target.setHours(0); target.setMinutes(0); target.setSeconds(0); target.setMilliseconds(0); let targetDay = target.getDay(); targetDay = targetDay === 0 ? 7 : targetDay; if (number === weekCount[0]) { console.log(month + '月第' + number + '周起始', target); result.begin = target.getTime(); target.setDate(target.getDate() + (7 - targetDay));//设置到周日最后一秒 target.setHours(23); target.setMinutes(59); target.setSeconds(59); target.setMilliseconds(0); console.log(month + '月第' + number + '周截止', target); result.end = target.getTime(); console.log(result); return result; } target.setDate(target.getDate() + (7 - targetDay) + 1);//对其到周一,设置到第二个周一0时0分0秒 target.setDate(target.getDate() + 7 * (number - 2));//设置到第n周周日 console.log(month + '月第' + number + '周起始', target); result.begin = target.getTime(); if (number === weekCount[weekCount.length - 1]) { target.setMonth(month);//次月1日 target.setDate(1); target.setHours(0); target.setMinutes(0); target.setSeconds(0); target.setMilliseconds(-1);//向前到当月最后1毫秒 result.end = target.getTime(); console.log(month + '月第' + number + '周截止', target); console.log(result); return result; } target.setDate(target.getDate() + 6);//设置到第n周周日 target.setHours(23); target.setMinutes(59); target.setSeconds(59); target.setMilliseconds(0); result.end = target.getTime(); console.log(month + '月第' + number + '周截止', target); console.log(result); return result; } /** * 获取每月有多少周 * @param {*} year * @param {*} month */ function getWeekCountInMonth(year, month) { const list = []; const target = new Date(); let offset = 1; target.setFullYear(year); target.setMonth(month - 1); target.setDate(1); target.setHours(0); target.setMinutes(0); target.setSeconds(0); target.setMilliseconds(0); let targetDay = target.getDay(); targetDay = targetDay === 0 ? 7 : targetDay; if (targetDay !== 1) { console.log(targetDay); list.push(offset); offset = offset + 1; target.setDate(target.getDate() + (7 - targetDay) + 1);//对齐到周一 } for (let i = offset; i <= 5; i++) { list.push(offset); offset = offset + 1; target.setDate(target.getDate() + 7);//设置到次周一0时分秒 target.setMilliseconds(-1);//向前1毫秒到本周最后1毫秒 console.log(target); if ((target.getMonth() + 1) !== month) { break; } } console.log(month + '月周数', list); return list; } /** * 获取上一月时间 * @param {} date */ function getPreMonth (date) { var _date = dateFormat('YYYY-MM', new Date(date)); var arr = _date.split('-'); var year = arr[0]; // 获取当前日期的年份 var month = arr[1]; // 获取当前日期的月份 var day = arr[2]; // 获取当前日期的日 var days = new Date(year, month, 0); days = days.getDate(); // 获取当前日期中月的天数 var year2 = year; var month2 = parseInt(month) - 1; if (month2 === 0) { year2 = parseInt(year2) - 1; month2 = 12; } var day2 = day; var days2 = new Date(year2, month2, 0); days2 = days2.getDate(); if (day2 > days2) { day2 = days2; } if (month2 < 10) { month2 = '0' + month2; } var t2 = year2 + '-' + month2; return t2; } /** * 获取下一月时间 * @param {时间} date */ function getNextMonth (date) { var _date = dateFormat('YYYY-MM', new Date(date)); var arr = _date.split('-'); var year = arr[0]; // 获取当前日期的年份 var month = arr[1]; // 获取当前日期的月份 var day = arr[2]; // 获取当前日期的日 var days = new Date(year, month, 0); days = days.getDate(); // 获取当前日期中的月的天数 var year2 = year; var month2 = parseInt(month) + 1; if (month2 === 13) { year2 = parseInt(year2) + 1; month2 = 1; } var day2 = day; var days2 = new Date(year2, month2, 0); days2 = days2.getDate(); if (day2 > days2) { day2 = days2; } if (month2 < 10) { month2 = '0' + month2; } var t2 = year2 + '-' + month2; return t2; } /** * 格式化时间 * @param {YYYY-MM-DD hh:mm:ss} String * @param {时间} date */ function dateFormat (fmt, date) { date = new Date(date); let ret; let opt = { 'Y+': date.getFullYear().toString(), // 年 'M+': (date.getMonth() + 1).toString(), // 月 'D+': date.getDate().toString(), // 日 'h+': date.getHours().toString(), // 时 'm+': date.getMinutes().toString(), // 分 's+': date.getSeconds().toString() // 秒 // 有其他格式化字符需求可以继续添加，必须转化成字符串 }; for (let k in opt) { ret = new RegExp('(' + k + ')').exec(fmt); if (ret) { fmt = fmt.replace(ret[1], (ret[1].length === 1) ? (opt[k]) : (opt[k].padStart(ret[1].length, '0'))); } } return fmt; } // getMonthBeginEnd(2019, 9); // getDateBeginEnd(2019, 10, 16); // getWeekByMonth(2019, 10, 5);
前面或后面多少天
GetPreDay(val) { let day = new Date(new Date().getTime() - val * 24 * 60 * 60 * 1000) return day }
标准时间和时间戳互转
let timestamp = (new Date()).valueOf(); console.log(new Date(timestamp))
到元素位置
// 方法1：scrollTop 滚动到某位置 document.documentElement.scrollTop = 500 // 方法2：scrollTo，scrollBy，scroll滚动到某位置 // ref的元素不能是display:none，要加this.$nextTick this.$nextTick(() => { this.$refs.kkkkk.scrollTo(0, 500) }) // 方法3：scrollIntoView() 实现滚动到具体某元素 this.$nextTick(() => { let container = this.$el.querySelector('.echarts-wrapper') container.scrollIntoView() })
平滑滚动
//console.log(this.$el.querySelector('.echarts-wrapper').getBoundingClientRect()) // behavior 类型String,表示滚动行为,支持参数 smooth(平滑滚动),instant(瞬间滚动),默认值auto,实测效果等同于instant window.scrollTo({ top: this.$el.querySelector('.echarts-wrapper').getBoundingClientRect().top, behavior: 'smooth' })
以流的方式下载文件
// res.data为请求到的blob let url = window.URL.createObjectURL(res.data) let link = document.createElement('a') link.style.display = 'none' link.href = url link.setAttribute('download', filename) document.body.appendChild(link) link.click()
获取图片大小
function checkPicurl(url) { let img = new Image() img.src = url img.onerror = function () { alert(name + ' 图片加载失败，请检查url是否正确') return false } if (img.complete) { console.log(img.width + ' ' + img.height) } else { img.onload = function () { console.log(img.width + ' ' + img.height) img.onload = null//避免重复加载 } } } checkPicurl('http://www.helloin.com/webpic/20160830/20160830165639_6406.jpg')
页面切换动画
<transition name="slide-fade"> <router-view/> </transition>
.slide-fade { position: absolute; left: 0; right: 0; } .slide-fade-enter-active { transition: all 0.5s ease; } .slide-fade-leave-active { transition: all .1s cubic-bezier(2.0, 0.5, 0.5, 1.0); } .slide-fade-enter, .slide-fade-leave-to { left: 0; right: 0; transform: translateX(50px); opacity: 0; }
无缝滚动（上）demo list1 list2高度需要一致
let box = document.getElementById('demo'); let l1 = document.getElementById('list1'); let l2 = document.getElementById('list2'); l2.innerHTML = l1.innerHTML; function scrollup() { if (box.scrollTop >= l1.offsetHeight) { box.scrollTop = 0; } else { box.scrollTop++; } } let scrollMove = setInterval(scrollup, 80); box.onmouseover = function () { clearInterval(scrollMove) }; box.onmouseout = function () { scrollMove = setInterval(scrollup, 80); }
无缝上下滚动 左右滚动
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> * { margin: 0; padding: 0; list-style-type: none; } a, img { border: 0; } body { font: 12px/180% Arial, Helvetica, sans-serif, "新宋体"; } /* marqueeleft */ .marqueeleft { height: 136px; width: 474px; overflow: hidden; margin: 40px auto; } .marqueeleft ul { float: left; } .marqueeleft li { float: left; margin: 0 5px; display: inline; width: 148px; height: 133px; overflow: hidden; } .marqueeleft li .pic { display: block; border: #ccc 1px solid; width: 135px; height: 104px; padding: 2px; overflow: hidden; } .marqueeleft li .txt { text-align: center; height: 23px; line-height: 23px; } /* marqueetop */ .marqueetop { height: 329px; width: 148px; overflow: hidden; margin: 40px auto; } .marqueetop li { padding: 5px 0; width: 148px; height: 133px; overflow: hidden; } .marqueetop li .pic { display: block; border: #ccc 1px solid; width: 135px; height: 104px; padding: 2px; overflow: hidden; } .marqueetop li .txt { text-align: center; height: 23px; line-height: 23px; } </style> </head> <body> <div id="marquee1" class="marqueeleft"> <div style="width:8000px;"> <ul id="marquee1_1"> <li> 11111111 </li> <li> 11111111 </li> <li> 11111111 </li> <li> 11111111 </li> </ul> <ul id="marquee1_2"></ul> </div> </div><!--marqueeleft end--> <div id="marquee2" class="marqueetop"> <div style="height:8000px;"> <ul id="marquee2_1"> <li> 11111111 </li> <li> 11111111 </li> <li> 11111111 </li> <li> 11111111 </li> </ul> <ul id="marquee2_2"></ul> </div> </div><!--marqueeleft end--> <script> //js无缝滚动代码 function marquee(i, direction) { var obj = document.getElementById('marquee' + i); var obj1 = document.getElementById('marquee' + i + '_1'); var obj2 = document.getElementById('marquee' + i + '_2'); if (direction == 'up') { if (obj2.offsetTop - obj.scrollTop <= 0) { obj.scrollTop -= (obj1.offsetHeight + 20); } else { var tmp = obj.scrollTop; obj.scrollTop++; if (obj.scrollTop == tmp) { obj.scrollTop = 1; } } } else { if (obj2.offsetWidth - obj.scrollLeft <= 0) { obj.scrollLeft -= obj1.offsetWidth; } else { obj.scrollLeft++; } } } function marqueeStart(i, direction) { var obj = document.getElementById('marquee' + i); var obj1 = document.getElementById('marquee' + i + '_1'); var obj2 = document.getElementById('marquee' + i + '_2'); obj2.innerHTML = obj1.innerHTML; var marqueeVar = window.setInterval('marquee(' + i + ', \'' + direction + '\')', 50); obj.onmouseover = function () { window.clearInterval(marqueeVar); } obj.onmouseout = function () { marqueeVar = window.setInterval('marquee(' + i + ', \'' + direction + '\')', 50); } } marqueeStart(1, 'left'); marqueeStart(2, 'up'); </script> </body> </html>
自定点击
1.若是没有v-for循环，则直接放入directive自定义指令。 <template> <div class="clickdown" @click="myClick()" v-clickDown>自动点击</div> </template> export default { directives: { clickDown: { inserted(el) { el.click() } } } } 2.若是有v-for循环，需要自动点击索引第一个，则需要binding。 <template> <div class="clickdown" @click="myClick()" v-for="(item,index) in list" :key="index" v-clickDown="index">自动点击索引第一个</div> </template> export default { directives: { clickDown: { inserted(el,binding,index) { if(binding.value===0){ el.click() } } } } }
css已知盒子大小，盒子中的图片铺满但不变形
css方法
.banner
width 100%
height 100vw
background-color pink
overflow hidden
img
width 100%
height 100%
object-fit cover
js方法
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title></title> <style> .div{width:400px;height: 400px;border:1px solid #ddd; overflow: hidden;} img{width: 100%;} </style> </head> <body> <div class="div" id="div"> <img src="img/test.jpg" id="ele" /> </div> </body> <script> var ele = document.getElementById("ele"); var div = document.getElementById("div"); ele.onload = function(){ if(ele.naturalHeight < div.offsetHeight){ ele.style.width = "auto"; ele.style.height = "100%"; } } </script> </html>
使用resize时间，键盘弹起会触发该事件，此时window.innerHeight比窗口高度要小，进行按钮的隐藏即可，完美兼容ios和安卓
// 窗口高度 const H = window.innerHeight // 页面初始化后绑定resize方法 window.addEventListener('resize', () => { if (window.innerHeight < H) { // 隐藏按钮 this.showBtn = false }) } else { // 显示按钮 thisshowBtn = true }) } })
如果想在methods中使用filters的方法,相应的就有两种方法
使用全局的filter： Vue.filters['filterName'] (val) 使用局部的filter: this.$options.filters['filterName'] (val)
调用微信扫码（先获取签名）
configWx(apiList, callback) { let url = location.href.split('#')[0]; let that = this; getWXSign(url).then(res => { console.log(res.data.data); that.appId = res.data.data.appid; that.timestamp = res.data.data.timestamp; that.nonceStr = res.data.data.noncestr; that.signature = res.data.data.signature; // eslint-disable-next-line no-undef wx.config({ debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来， appId: that.appId, // 必填，公众号的唯一标识 timestamp: that.timestamp, // 必填，生成签名的时间戳 nonceStr: that.nonceStr, // 必填，生成签名的随机串 signature: that.signature, // 必填，签名 jsApiList: apiList // 必填，需要使用的JS接口列表 }); setTimeout(() => { callback(); }, 500); }); },
const apiList = ['scanQRCode', 'chooseImage', 'uploadImage']; this.configWx(apiList, () => { // eslint-disable-next-line no-undef wx.ready(function() { // eslint-disable-next-line no-undef // wx.scanQRCode({ // needResult: 1, // 默认为0，扫描结果由微信处理，1则直接返回扫描结果， // scanType: ['qrCode', 'barCode'], // 可以指定扫二维码还是一维码，默认二者都有 // success: function(res) { // let result = res.resultStr; // 当needResult 为 1 时，扫码返回的结果 // console.log(result); // }, // fail: function() { // if (typeof fail === 'function') { // console.log('调用扫码失败'); // } // } // }); // eslint-disable-next-line no-undef wx.chooseImage({ count: 1, // 默认9 sizeType: ['original', 'compressed'], // 指定是原图还是压缩图，默认都有 sourceType: ['album', 'camera'], // 指定来源是相册还是相机，默认都有 success: function(res) { let localIds = res.localIds; // 返回选定照片的本地ID列表，localId可以作为img标签的src属性显示图片 // eslint-disable-next-line no-undef wx.uploadImage({ localId: localIds.toString(), // 需要上传的图片的ID，由chooseImage接口获得 isShowProgressTips: 1, // 进度提示 success: function(res) { let serverId = res.serverId; // 返回图片的服务器端ID，即mediaId //将获取到的 mediaId 传入后台 方法savePicture // uploadImageFile(mediaId).then(res => { // console.log(res.data.data); // }); // eslint-disable-next-line no-undef }, fail: function(res) { this.$toast('图片上传失败，请重试'); } }); } }); }); });
取消鼠标右键限制 javascript:alert(document.onselectstart = document.onbeforecopy = document.oncontextmenu = document.onmousedown = document.onkeydown = function(){return true;});void(document.body.onmouseup=''); void(document.body.onselectstart=''); void(document.body.onmouseup=''); void(document.body.oncopy='');
按钮切换，选择取消
<span class="btn" v-for="(item, index) in msg" :class="{ isActive: isChange === index }" @click="isChoose(index, item)">{{ item.name }}</span>
data() { return { msg: [ { name: '项目1', id: 1 }, { name: '项目2', id: 2 }, { name: '项目3', id: 3 } ], isChange: -1 }; }, isChoose(index, item) { if (index !== this.isChange) { this.isChange = index; } else { this.isChange = -1; } }
不使用%来判断奇数还是偶数
function isEven(num){ if(num&1){ return false; }else{ return true; } } // 递归 function isEven(num){ if(num < 0 || num === 1){ return false; } if(num == 0 ) { return true; } return isEven(num -2); }
取数据
let table = [ 'H', 'Hydrogen', '1.00794', 1, 1, 'He', 'Helium', '4.002602', 18, 1, 'Li', 'Lithium', '6.941', 1, 2, 'Be', 'Beryllium', '9.012182', 2, 2, 'B', 'Boron', '10.811', 13, 2, 'C', 'Carbon', '12.0107', 14, 2, 'N', 'Nitrogen', '14.0067', 15, 2, 'O', 'Oxygen', '15.9994', 16, 2, 'F', 'Fluorine', '18.9984032', 17, 2, 'Ne', 'Neon', '20.1797', 18, 2, 'Na', 'Sodium', '22.98976...', 1, 3, 'Mg', 'Magnesium', '24.305', 2, 3, 'Al', 'Aluminium', '26.9815386', 13, 3, 'Si', 'Silicon', '28.0855', 14, 3 ]; for (let i = 0; i < table.length; i += 5) { console.log(table[i]) }
运行计时
console.time("str") //开始
console.timeEnd("str") //结束
任意进制转换
(13558780000).toString(36)
转换回来
parseInt('688jpls',36)
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