js生成div

<div id="box"> ???<!--<div>1</div>--></div>

*{ ???margin: 0; ???padding: 0; ???}#box{ ???width: 500px; ???height: 500px; ???margin: 20px auto 0; ???position: relative;}#box div{ ???width: 30px; ???height: 30px; ???text-align: center; ???line-height: 30px; ???color: #fff; ???font-weight: bold; ???font-size: 16px; ???position: absolute;}

var oBox=document.getElementById("box");var arr_color=["darkmagenta","darkgreen","darkcyan","palegreen","plum","deeppink","deepskyblue"];var str="";

//left计算：i%10*40
//top计算通过向下取整：Math.floor(i/10)*40

for (var i=0;i<100;i++) { ???str+="<div style=‘left:"+i%10*40+"px;top:"+Math.floor(i/10)*40+"px;background:"+arr_color[i%6]+";‘>"+i+"</div>"; ???????????}oBox.innerHTML=str;