JQ用法的if用法：
<!DOCTYPE html>
<html>
<head>
<script src="Scripts/jquery-1.6.2.min.js" type="text/javascript"></script>
<script src="Scripts/tmpl.js" type="text/javascript"></script>
</head>
<body>
<script id="DeptTemplate" type="text/x-jquery-tmpl">
Title:${Name}
{{if Emp.length}}
成员：${$item.getEmp("-")}
{{/if}}
<br />
Title:${Name}
{{if Emp.length==2}}
成员：${$item.getEmp("-")}
{{/if}}
<br />
</script>
<div id="DeptList">
</div>
<script>
var deptlist = [
{ Name: "销售部", Emp: ["张三", "李四"] },
{ Name: "软件部", Emp: [] },
{ Name: "网络部", Emp: ["王二麻子", "王小"] }
];
$("#DeptTemplate").tmpl(deptlist,
{
getEmp: function (separator) {
return this.data.Emp.join(separator);
}
}).appendTo("#DeptList");
</script>
</body>
</html>
--输出结果