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js生成div

mar innerhtml idt document epp pin arr image ont

1.生成100個div

要點根據索引值i計算left和top值,div逢10換行

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HTML

<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; }

JS

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

//left計算:i%10*40
//top計算通過向下取整: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;

js生成div