通过jQuery触发select的change事件的方法示例：

html代码：

<select class="custom-select" name="fldm" id="fldm">
	<option selected value="">Choose...</option>
	<option value="https://www.02405.com/category/ui">大前端</option>
	<option value="https://www.02405.com/category/program">程序开发</option>
	<option value="https://www.02405.com/category/mobile">移动开发</option>
</select>

jquery代码：

let fldm = $("#fldm");
fldm.change(function(){
	console.log("select change");
});
fldm.trigger("change");
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