为什么以上代码不能动态插入图片

为什么以下代码不能动态插入图片？

HTML code

 <div class="dashboard-sign"></div>

JScript code

var rootDom=$(".dashboard-sign");    for(var i=0; i<$(dashboard_statusitems).length;i++) {        var dashboard_statusitem = dashboard_statusitems[i];        var status = $(dashboard_statusitem).html();        var img01 = document.createElement("img");        if(status=="ok"){            img01.setAttribute("src", "images/circle_ok_16.png");            rootDom.appendChild(img01);        }        else if(status=="SEND WAITING"){            img01.setAttribute("src", "images/circle_SEND WAITING_16.png");            rootDom.appendChild(img01);        }        else{          ``````````````````        }    }

[解决办法]
试试：
var rootDom=$(".dashboard-sign");
for(var i=0; i<$(dashboard_statusitems).length;i++) {
var dashboard_statusitem = dashboard_statusitems[i];
var status = $(dashboard_statusitem).html();

var img01 = document.createElement("img");
if(status=="ok"){ img01.src="images/circle_ok_16.png"; }
else if(status=="SEND WAITING"){ img01.src="images/circle_SEND WAITING_16.png"; }
else{}
rootDom.appendChild(img01);
}

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