var div = document.getElementById("parent");
while(div.hasChildNodes()) //当div下还存在子节点时 循环继续
{
div.removeChild(div.firstChild);
}
var node0 = document.getElementById("parent");
var node1 = document.createElement('dt');
node1.innerHTML = arr1[i]+"还有"+arr2[i].replace(/(^\s*)|(\s*$)/g,"")+"条"+arr3[i].replace(/(^\s*)|(\s*$)/g,"")+"工单未完成";
node0.insertBefore(node1);