每天一个JS 小demo之商品下架特效制作，主要知识点：定时器，倒计时，抖动特效。

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.clear:after {
content: '';
display: block;
clear: both;
}
ul {
list-style: none;
margin: 100px auto 0;
padding: 0;
width: 1300px;
border: 1px solid #000;
}
li {
padding: 10px;
float: left;
width: 300px;
position: relative;
}
li div {
text-align: center;
}
li div:nth-of-type(2) {
margin: 20px 0;
text-align: center;
}
li div:nth-of-type(2) span {
padding: 10px;
background: #e15671;
color: white;
border-radius: 10px;
}
.text1 {
width: 240px;
}
li div:nth-of-type(3) {
padding: 20px;
}
.goods_name {
line-height: 40px;
}
.img {
width: 100px;
height: 140px;
}
li .sold_out {
position: absolute;
left: -38px;
-left: 61px;
top: 0;
-top: 76px;
width: 396px;
-width: 198px;
height: 396px;
-height: 198px;
opacity: 0;
display: none;
z-index: 999999;
}
li .mask {
width: 100%;
height: 100%;
position: absolute;
left: 0;
top: 0;
z-index: 999;
background: rgb(0,0,0);
opacity: 0;
display: none;
}
/*li .sold_out {*/
/*position: absolute;*/
/*left: 84px;*/
/*top: 134px;*/
/*width: 132px;*/
/*height: 132px;*/
/*}*/

.table {
margin: 30px auto 0;
width: 1300px;
}
tbody tr {
opacity: 0;
}
tbody img {
width: 50px;
height: 50px;
}
</style>
</head>

<body>

<ul class="clear">
<li>
<div>
<input type="text" class="text1">
<button>确定</button>
</div>
<div class="time">
剩余：
<span>0</span>
<span>0</span>
:
<span>0</span>
<span>0</span>
:
<span>0</span>
<span>0</span>
</div>
<div>
<img class="img" src="images/goods_1.png" alt="">
</div>
<div>
<strong class="goods_name">iphone6s</strong>
</div>
<div>
抢购价：<span class="goods_price">￥ 6000</span>
</div>

<img class="sold_out" src="images/sold-out.png" alt="">
<div class="mask"></div>
</li>
<li>
<div>
<input type="text" class="text1">
<button>确定</button>
</div>
<div class="time">
剩余：
<span>0</span>
<span>0</span>
:
<span>0</span>
<span>0</span>
:
<span>0</span>
<span>0</span>
</div>
<div>
<img class="img" src="images/goods_4.png" alt="">
</div>
<div>
<strong class="goods_name">iWatch</strong>
</div>
<div>
抢购价：<span class="goods_price">￥ 2000</span>
</div>

var liElements = document.querySelectorAll('li');
var tbodyElements = document.querySelector('.table tbody');

liElements.forEach(function (li) {
soldOut(li);
});

function soldOut(li) {
/*
* 以其中给一个li来做逻辑处理
* */
var buttonElement = li.querySelector('button');
var text1Element = li.querySelector('.text1');
var maskElement = li.querySelector('.mask');
var soldOutElement = li.querySelector('.sold_out');
var timeSpanElement = li.querySelectorAll('.time span');

var goodsName = li.querySelector('.goods_name').innerHTML;
var goodsPrice = li.querySelector('.goods_price').innerHTML;
var goodsImg = li.querySelector('.img').src;

/*
* 点击按钮获取倒计时的时间
* */
buttonElement.onclick = function() {
var seconds = parseInt(text1Element.value);

/*
* 把seconds变成时分秒的格式，并计算倒计时
* */
var timer = setInterval(function () {
seconds--;

if (seconds >= 0) {
var timeArr = seconds2HMS(seconds).split('');

timeArr.forEach(function (item, index) {
timeSpanElement[index].innerHTML = item;
});
} else {
//时间到了
clearInterval(timer);
timeOver();
add2List();
}

}, 1000);

};

function timeOver() {
maskElement.style.display = 'block';
// maskElement.style.opacity = '0.5';
animation(maskElement, {
opacity: 0.5
}, 500);

soldOutElement.style.display = 'block';
animation(soldOutElement, {
width: 198,
height: 198,
left: 61,
top: 76,
opacity: 1
}, 500, 'bounceOut');

setTimeout(function () {
shake(li, 'left', 20, 2);
}, 200);
}

/*
* 添加当前的商品信息到表格列表中
* */
function add2List() {

tbodyElements.innerHTML += '<tr><td>'+goodsName+'</td><td>'+goodsPrice+'</td><td><img src="'+goodsImg+'"/></td></tr>';

var trElements = tbodyElements.querySelectorAll('tr');
//获取到最后一个tr，也就是当前最新一次添加的元素
// console.log(trElements[trElements.length - 1]);
// animation(trElements[trElements.length - 1], {
// opacity: 1
// }, 100);

trElements.forEach(function (tr) {
animation(tr, {
opacity: 1
}, 100);
}, 1000);

}
}

/*
* 把秒钟转成时分秒格式
* */
function seconds2HMS(seconds) {

var H = addZero(parseInt(seconds / 3600));
var M = addZero(parseInt(seconds % 3600 / 60));
var S = addZero(parseInt(seconds % 60));

return H + M + S;
}

function addZero(v) {
return (v < 10 ? '0' : '') + v;
}

/*
* 颤抖吧！
* */
function shake(element, attr, range, step) {

/*
* 获取元素在颤抖之前的位置
* */
var originValue = getCss(element, attr);
/*
* 表示+还是-
* */
var flag = true;

var timer = setInterval(function () {

if (flag) {
//先负
element.style[attr] = originValue - range + 'px';
} else {
element.style[attr] = originValue + range + 'px';
//自减
range -= step;

if (range <= 0) {
element.style[attr] = originValue + 'px';
clearInterval(timer);
}
}

flag = !flag;

}, 16);

}

function getCss(element, attr) {
return parseFloat(element.currentStyle ? element.currentStyle[attr] : getComputedStyle(element)[attr]);
}
</script>
</body>
</html>

function animation(ele, attrs, duration, fx, callback) {

if (ele.timer) {
return;
}
var d = duration || 1000;
var obj = {};
for (var attr in attrs) {
obj[attr] = {};
obj[attr].b = parseFloat(getComputedStyle(ele)[attr]); obj[attr].c = attrs[attr] - obj[attr].b;
}

var fx = fx || 'linear';
var callback = callback || function(){};

var startTime = Date.now();

ele.timer = setInterval(function () {

var t = Date.now() - startTime;

if (t >= d) {
t = d;
}

for (var attr in attrs) {
var value = Tween[fx](t, obj[attr].b, obj[attr].c, d);

if (attr == 'opacity') {
ele.style[attr] = value;
} else {
ele.style[attr] = value + 'px';
}
}

if (t == d) {
clearInterval(ele.timer);
ele.timer = null;
callback();
}

}, 16);
}

posted @ 2017-06-03 10:26 catEatBird 阅读(819) 评论(0) 收藏举报

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catEatBird

每天一个JS 小demo之商品下架特效制作，主要知识点：定时器，倒计时，抖动特效。

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