By jquery trigger select their own change event

### by jquery trigger select their own change event

1. come and change events triggered by select js
code is as follows: section contains the html and js part

//html部分
<select class="select-area" id="province_id" name="province" onchange="selectProvince(this)">
    <option value="0">选择省份</option>
    <volist name="province_list" id="province">
        <option  value="{$province.id}">{$province.name}</option>
    </volist>
</select>

//js部分：
//select原本自身的change事件方法
function selectProvince(obj){
    //具体的业务逻辑
    **********************
    **********************
}

//js去触发select的change事件
var provinceObj = $('#province_id');   //定义select对象
provinceObj.value = areaInfo.province; //select对象赋值
//**核心代码** trigger函数去触发select的change事件
provinceObj.trigger('change', selectProvince(provinceObj));

2. Other:

//设置select的某个option选中,尽量不要用attr，微信端不生效
$('#select').prop('selected', true);