js检查页面上有无重复id

检测重复ID的JavaScript方法

最新推荐文章于 2024-04-19 10:47:35 发布

转载最新推荐文章于 2024-04-19 10:47:35 发布 · 2.5k 阅读

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本文介绍了两种使用JavaScript检查HTML文档中是否存在重复ID的方法。第一种方法是在页面加载完成后遍历所有元素，对比每个元素的ID是否重复。第二种方法则是先生成大量带有随机ID的元素并插入DOM中，随后检查是否有重复的ID出现。这两种方法对于确保网页遵循W3C标准，避免因ID重复导致的问题非常有用。

方法一：

=================================================================================

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<script type="text/javascript">
    window.onload = function(){
        var tags = document.getElementsByTagName("*"),
            count = tags.length, time, ret = {}, id;
        time = new Date();
        for(var i = 0; i < count; i++){
            id = tags[i].id;
            if(id){
                if(ret[id]){
                    alert(id + "/n用时：" + (new Date() - time));
                    return;
                }else{
                    ret[id] = true;
                }
            }
        }
        alert("未找到相同ID");
    }
</script>
</HEAD>

<BODY>
<script type="text/javascript">
    (function(){
        var html = [], rnd = parseInt(Math.random() * 1000);
        for(var i = 0; i < 1000; i++){
            html.push("<div id='a" + i + "'>" + i + "</div>");
        };
        //在随机位置插入一个随机的id
        i = parseInt(Math.random() * 1000);
        html[i] = html[i] + ("<div id='a" + rnd + "'>" + rnd + "</div>");
        document.write(html.join(""));
    })();
</script>
</BODY>
</HTML>
================================================================================

方法二：

================================================================================

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<script type="text/javascript">
    function createDiv(){
        var html = [], id;
        for(var i = 0; i < 2000; i++){
            id = "divId" + parseInt(Math.random() * 10000);
            html.push("<div id='" + id + "'>" + id + "</div>");
        }
        document.body.innerHTML = html.join("");
    }
    window.onload = function(){
        createDiv();

        var oID = {} , result = {}, arr = [],
            tags = document.getElementsByTagName("*");
        for(var i = 0, id; i < tags.length; i++){
            id = tags[i].id;
            if(id){
                oID[id] = oID[id] ? oID[id] + 1 : 1;
                if(oID[id] > 1){
                    result[id] = id + " " + oID[id]; } } } for(var o in result){
            arr.push(result[o]);
        }
        alert(arr.join("/t"));
    };
</script>
</HEAD>

<BODY>
</BODY>
</HTML>
==================================================================