js中標簽字符串的拼接

//1.用單雙引號拼接
var valueDemo = "111";
var htmlStrs1 = '<option selected="selected" value="'+valueDemo+'"></option>';
alert(htmlStrs1);
//2.通過轉義字符拼接
var htmlStrs2 = "<option selected=\"selected\" value=\""+valueDemo+"\">"+valueDemo+"</option>";
alert(htmlStrs2);
//3.通過Jqquery直接創建標簽對象
$("<option></option>")