js样式操作几个小练习

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<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title></title>
    <meta charset="utf-8" />
</head>
<body>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <a href="http://www.baidu.com" target="_blank" title="百度一下">百度</a>
    <button id="btn1">点击使下表变色</button>
    <table id="tbl1" border="1">
        <tr>
            <td>哈哈</td><td>哈哈</td><td>哈哈</td>
        </tr>
         <tr>
            <td>哈哈</td><td>哈哈</td><td>哈哈</td>
        </tr>
        <tr>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
        </tr>
        <tr>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
        </tr>
    </table>
    <input /><input /><input /><input /><input /><input /><input /><input /><input /><input /><input />
    <table id="tbl2" border="1">
        <tr>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
        </tr>
        <tr>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
        </tr>
        <tr>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
        </tr>
        <tr>
            <td>哈哈</td>
            <td>哈哈</td>
            <td>哈哈</td>
        </tr>
    </table>
    <script type="text/javascript">
        window.onload = function () {
            var aObjs = document.getElementsByTagName('a');
            for (var i = 0; i < aObjs.length; i++) {
                aObjs[i].onclick = function () {
                    for (var j = 0; j < aObjs.length; j++) {
                        aObjs[j].style.backgroundColor = 'white';
                    }
                    this.style.backgroundColor = 'red';
                    return false;
                };
            }
            document.getElementById('btn1').onclick = function () {
                var trObjs = document.getElementById('tbl1').getElementsByTagName('tr');
                for (var m = 0; m < trObjs.length; m++) {
                    if (m % 2 == 0) {
                        trObjs[m].style.backgroundColor = 'red';
                    }
                    else {
                        trObjs[m].style.backgroundColor = 'green';
                    }
                }
            };
            var txtObjs = document.getElementsByTagName('input');
            for (var n = 0; n < txtObjs.length; n++) {
                if (txtObjs[n].type == 'text') {
                    txtObjs[n].onblur = function () {
                        this.style.backgroundColor = 'yellow';
                    };
                    txtObjs[n].onfocus = function () {
                        this.style.backgroundColor = 'red';
                    };
                }
            }
            var trObjs2 = document.getElementById('tbl2').getElementsByTagName('tr');
            for (var k = 0; k < trObjs2.length; k++) {
                trObjs2[k].onclick = function () {
                    for (var c = 0; c < trObjs2.length; c++) {
                        trObjs2[c].style.backgroundColor = 'white';
                    }
                    this.style.backgroundColor = 'red';
                };
            }
        };
    </script>
</body>
</html>

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转载自blog.csdn.net/qq_32077521/article/details/97615561