分裂

時間 2019-11-18
標籤分裂简体版
原文原文鏈接
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
        #circle{position:relative;width: 600px; height: 600px;background: #ff0000;border-radius: 50%;margin:0 auto;}
        .c{position: absolute; width: 50%; height: 50%;background: #00ff00;border-radius: 50%;}
    </style>
</head>
<body>
<div id="circle">
    <!--<div></div>-->

    </div>
    <script>
     var circleObj=document.getElementById("circle");
     var cObj=circleObj.getElementsByTagName("div");
        circleObj.onmouseenter=function(){
            fenLie(this) };
     function fenLie(obj){
            var frag=document.createDocumentFragment();//建立碎片至關於一個空容器，將div打包入這個frag
            for(var i=0;i<4;i++){
            var div=document.createElement("div");
                if(i==0){
                    div.style.left="0px";
                    div.style.top="0px";
                }
                else if(i==1){
                    div.style.right="0px";
                    div.style.top="0px";
                                }
                else if(i==2){
                    div.style.left="0px";
                    div.style.bottom="0px";
                                }
                else if(i==3){
                    div.style.right="0px";
                    div.style.bottom="0px";
                                }//使用定位，兼容IE7
            div.className="c";
                div.style.background=color();
                div.onmouseenter=function(){
                fenLie(this);}

            frag.appendChild(div);//在最後插入div
            }
        obj.appendChild(frag);
        obj.style.background="none";
        obj.onmouseenter=null;
     }//解綁
     function color(){
         var arr=["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];//顏色是十六進制
         var str="#";
         for(var i=0;i<6;i++){
             var r=Math.floor(Math.random()*16);//產生0-15之間的隨機數；
             str+=arr[r];//隨機選擇在數組的第幾位，而且拼接起來
         }
         return str;
     }
        // }
    </script>
</body>
</html>
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