js检查页面上有无重复id的实现代码_javascript技巧

方法一：

");
        };
        //在随机位置插入一个随机的id
        i = parseInt(Math.random() * 1000);
        html[i] = html[i] + ("");
        document.write(html.join(""));
    })();
 

方法二：

");
        }
        document.body.innerHTML = html.join("");
    }
    window.onload = function(){
        createDiv();

        var oID = {} , result = {}, arr = [],
            tags = document.getElementsByTagName("*");
        for(var i = 0, id; 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"));
    };