怎么动态给table加序号啊

$.each(JSON.parse(data), function (index,o) {
s += "

";

s += "";
for (var i = 1; i < 6; i++) {
s+= i.toString().substring(0, 1);
};
s += "" + o.UserInfo.UserID + "";
s += "" + o.UserInfo.UserName + "";
s += "" + o.DepartmentList.DeptName + "";
s += "";
s += "";
s += "<p onclick='look(" + o.UserIn
第一列怎么加啊

 var rowindex = 0; // 加上
$.each(JSON.parse(data), function (index,o) {
rowindex++; //加上


s += "<td>" + rowindex + "</td>";
s += "<td>" + o.UserInfo.UserID + "</td>";