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The difference between $('#') and $('#'+xx) in jquery

青灯夜游
青灯夜游forward
2020-12-30 09:21:082406browse

This article will introduce to you the difference between $("#") and $("#" xx) in jquery. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

The difference between $('#') and $('#'+xx) in jquery

Recommended tutorial: jQuery tutorial

$("#") and $("#" in jquery xx )

$("#") means that the selector selects elements with id, for example You can use $("#id").val() to get the corresponding data value. If there is a plus sign in it, there is usually a variable, which is commonly used when encapsulating functions.

For example: The following small demo

<script src="jquery-1.8.3.js"></script>
 <body>
  <input type="text" value="a1" id="a1"><br/>
  <input type="text" value="a2" id="a2"><br/>
  <input type="text" value="a3" id="a3"><br/>
  <input type="text" value="a4" id="a4"><br/>
  <input type="text" value="a5" id="a5"><br/>
  <input type="button" value="点击测试" οnclick="test_()">
 </body>
 <script>
	function test_() {
		var a1=$("#a1").val();
		alert(a1);
		for(var i=1;i<=5;i++) {
		//这里+只是一个连接的作用,总得来说就是jquery的选择器,没有区别的说法
			var a=$("#a"+i).val();
			alert(a);
		}
	}
 </script>
</html>

The + here is just a connection function. Generally speaking, it is the selector of jquery. There is no difference.

More For more programming related knowledge, please visit: Programming Teaching! !

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