怎么让select下的option选中

<select name="sex" id="sex">
    <option value="1">男</option>
    <option value="2">女</option>
</select>

$(function(){
    $("#sex").find("option[value = '"+值+"']").attr("selected","selected");
})
$("#sex").find("option:contains('男')").attr("selected", true); 亲测可用

function fun(){
    document.getElementById("sex").value = 2;
}