JS之BOM

SCREEN

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Screen</title>
</head>
<body>

</body>
<script>
    console.log(screen.width);/*屏幕宽度*/
    console.log(screen.height);
    console.log(screen.availWidth);/*屏幕可用宽度*/
    console.log(screen.availHeight);
</script>
</html>

 

 

LOCATION

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>location</title>
</head>
<body>
<button onclick="assign()">加载新页面</button>
<button onclick="replace()">替换页面</button>
<button onclick="reload1()">刷新页面</button>
<button onclick="reload2()">彻底刷新页面</button>
</body>
<script>
    function assign() {
        /*可以返回老页面*/
        location.assign("http://www.baidu.com");
    }
    function replace() {
        /*不可以返回老页面*/
        location.replace("http://www.baidu.com");
    }
    function reload1() {
        location.reload();
    }
    function reload2() {
        location.reload(true)
    }
</script>
<!---->
<script>
    console.log(location.href);
    /*完整的url*/
    console.log(location.protocol);
    /*协议*/
    console.log(location.port);
    /*端口号*/
    console.log(location.hostname);
    /*主机名称*/
    console.log(location.pathname);
    /*路径名称*/
    console.log(location.search);
    /*？后的数据部分*/
</script>
</html>

 

 

HISTORY

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>history</title>
</head>
<body>
<h1>45</h1>
<a href="Demo46.html">Demo46</a>
<button onclick="forward()">下一个页面</button>
</body>
<script src="../../js/history.js"></script>
</html>

DEMO46

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>测试页1</title>
</head>
<body>
<h1>46</h1>
<a href="Demo47.html">Demo47</a>
<button onclick="back()">上一个页面</button>
<button onclick="forward()">下一个页面</button>
<button onclick="go(-1)">shang一个页面</button><!--与back同效-->
<button onclick="go(1)">xia一个页面</button><!--与forward同效-->
</body>
<script src="../../js/history.js"></script>
</html>

DEMO47

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>测试页2</title>
</head>
<body>
<h1>47</h1>
<a href="Demo48.html">Demo48</a>
<button onclick="back()">上一个页面</button>
<button onclick="forward()">下一个页面</button>
</body>
<script src="../../js/history.js"></script>
</html>

DEMO48

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>测试页3</title>
</head>
<body>
<h1>48</h1>
<a href="Demo48.html">Demo48</a>
<button onclick="back()">上一个页面</button>
</body>
<script src="../../js/history.js"></script>
</html>

 

 

Confirm

 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>confirm</title>
</head>
<body>

</body>
<script language="javascript" type="text/javascript">
    var flag = confirm("确认要删除此条信息吗？");
    if (flag) {
        alert("删除成功");
    } else {
        alert("取消删除");
    }
</script>
</html>

 

 

navigator

 

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Navigator</title>
</head>
<body>
<button onclick="close1()"></button>
</body>
<script>
    console.log(navigator.appName);
    console.log(navigator.appVersion);
    console.log(navigator.userAgent);
    console.log(navigator.platform);
    function close1() {
        window.close1();
    }
</script>
</html>

 

 

 

练习之页面转换-鲜花

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>鲜花</title>
</head>
<body>
<button onclick="detail()">鲜花详情</button>
<button onclick="refresh()">刷新当钱页面</button>
</body>
<script>
    function detail() {
        location.href="Demo50.html";
    }
    function refresh() {
//        location.reload();
        location=location;/*同上一样都是刷新效果*/
    }
</script>
</html>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>鲜花详情</title>
</head>
<body>
<p>bumai</p>
<button onclick="back()"></button>
</body>
<script>
    function back() {
        location.href = "Demo49.html"
    }
</script>
</html>

 

 

OPEN

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>OPEN</title>
</head>
<body>
<button onclick="openNewPage()">打开鲜花页面</button>
</body>
<script>
    function openNewPage() {
        window.open("Demo49.html", "xianhua", "height=300,width=500,left=50,top=100")
    }
</script>
</html>

 

 

定时器

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>定时器</title>
</head>
<body>
<button onclick="show()">五秒后显示helloworld</button>
<button onclick="cancelShow()">取消显示helloworld</button>
<button onclick="cancelShow2()">停止显示helloworld</button>
</body>
<script>
    //setTimeout            默认情况下，只会执行一次
    var hello;
    function show() {
        hello = setTimeout(function () {
            alert("HelloWorld!");
        }, 5000);                                       //5000=5000ms
    }
    function cancelShow() {
        clearTimeout(hello);
    }
</script>
<script>
    /*setinterval   根据指定的时间，循环执行*/
    var hello2 = setInterval(function () {
        console.log("HelloWorld!")                     //console在控制台看变化
    }, 1000)
    function cancelShow2() {
        clearTimeout(hello2);
    }
</script>
</html>

 

 

getelement系列方法

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>getelement系列方法</title>
</head>
<body>
<p id="jereh">杰瑞集团</p>
<p name="jredu">杰瑞教育</p>
<p name="jredu">杰瑞教育</p>
<button onclick="change()">变字体颜色！！</button>
<button onclick="change2()">字体变大！！</button>
<button onclick="change3()">全部字体变大！！</button>
</body>
<script>
    /*getElementById    通过id查找元素，只会返回一个匹配的元素*/
    function change() {
        document.getElementById("jereh").style.color = "red";
    }
    /*getElementByClassName     通过class查找元素，只会返回一个匹配的元素数组*/
    /*function change2() {
        var result = document.getElementsByClassName("jredu");
        //用这个函数就把上边杰瑞教育name改成class
        for (var i = 0; i < result.length; i++) {
            result[i].style.fontSize = "40px";
        }
    }*/
    /*getElementByName      通过name属性查找元素，只会返回一个匹配的元素数组*/
    function change2() {
        var result = document.getElementsByName("jredu");
        for (var i = 0; i < result.length; i++) {
            result[i].style.fontSize = "40px";
        }
    }
    /*getElementByTagName       通过标签查找元素，只会返回一个匹配的元素数组*/
    function change3() {
        var result = document.getElementsByTagName("p");
        for (var i = 0; i < result.length; i++) {
            result[i].style.fontSize = "40px";
        }
    }
</script>
</html>

 

 

Attribute

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Attribute</title>
</head>
<body>
<img src="../../../img/f3_Android1.png" alt="图片错误" id="img"><br>
<button onclick="getUrl()">获取图片路径信息</button>
<button onclick="changeUrl()">改变图片</button>
<button onclick="chan()">获取文本</button>
</body>
<script>
    var img = document.getElementById("img");
    function getUrl() {
//        var src = img.getAttribute("src");    //相对路径        //与下面语句两者作用相同，所以存在一个就ok
        var src = img.src;                      //绝对路径
        console.log(src);
    }
    function changeUrl() {
        img.setAttribute("src", "../../../img/f3_Android2.png");
//        img.src= "../../../img/f3_Android2.png"               //于上边函数一样，于上边语句的差别是相对绝对
    }

</script>
</html>

 

 

点符号法

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <style>
        .ccy {
            margin-top: 200px;
        }

        .yut {
            text-align: center;
            font-size: 30px;
            color: red;
        }
    </style>
    <title>点符号法</title>
</head>
<body>
<p id="school" class="ccy">青岛理工大学！</p>
<button onclick="change()">改变字体</button>
</body>
<script>
    var p = document.getElementById("school");
    function change() {
        /*1:style方法，逐个去给元素添加样式，速度慢！*/
//        p.style.color="red";
//        p.style,textAlign="center";
//        p.style.fontSize="40px";

        /*2:className方法，直接给元素添加一个样式类，速度快
         * 前提是样式类已经存在
         * 元素已存在默认类的时候，再次添加样类需要使用+="(空格)类名称"*/
//        document.getElementById("school").className="yut";

//        p.className += " yut";      //这样写两个类可以同时显示

        /*3:cssText 可以一次把多个样式写在样文本中*/
        p.style.cssText += ";color:red;font-size:40px;text-align:center";
    }
</script>
</html>

 

 

一个典型小例题：效果很不错

 <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <style>
        li{
            list-style: none;
            float: left;
            width: 200px;
            height: 40px;
            background-color: #878787;
            border-radius: 10px 10px 0 0;
            line-height: 40px;
            text-align: center;
        }
    </style>
    <title>TEXT</title>
</head>
<body>
<ul>
    <li>烟台大学</li>
    <li>青理大学</li>
    <li>山科大学</li>
</ul>
</body>
<script>
    var li = document.getElementsByTagName("li");
    for (var i = 0; i < li.length; i++) {
        li[i].onmousemove = function () {
            this.style.backgroundColor = "red";
        }
        li[i].onmouseout = function () {
            this.style.backgroundColor = "#cccccc";
        }
    }
</script>
</html>

效果图

鼠标悬浮在“烟台大学”上之后

 

 

行内样的获取

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <style>
        #yut {
            color: red;
        }
    </style>
    <title>行内样的获取</title>
</head>
<body>
<p id="yut" style="font-size: 40px">青岛理工大学</p>
</body>
<script>

    var p = document.getElementById("yut");
//    var style = p.style;                            /*.style    获取的全部为行内样式*/
    /*var style = window.getComputedStyle(p);         /!*W3C   获取元素的所有样式*!/
    var style = p.currentStyle;                     /!*IE    获取元素的所有样式*!/*/

    /*浏览器种类的区分不适用浏览器对象
    * 尝试用的方法为判断浏览器特有的属性和方法*/

    if (p.currentStyle){/*IE*/
        var style = p.currentStyle;                     /*IE    获取元素的所有样式*/
    }else{              /*W3C*/
        var style = window.getComputedStyle(p);         /*W3C   获取元素的所有样式*/
    }

    console.log(style.fontSize);
    console.log(style.color);           //没效果？因为只能获取行内样式
</script>
</html>

 

posted @ 2017-08-06 22:52  哈喽杏红  阅读(155)  评论(0)  编辑  收藏  举报