The following article will introduce to you the difference between $("#") and $("#" xx) in jquery. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
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$("#") refers to selection The selector selects an element with an id, such as You can use $("#id").val() to get the corresponding data value. If there is a plus sign in it, there is usually a variable. When encapsulating the function Commonly used, for example: the following small demo
<script src="jquery-1.8.3.js"></script>
<body>
<input type="text" value="a1" id="a1"><br/>
<input type="text" value="a2" id="a2"><br/>
<input type="text" value="a3" id="a3"><br/>
<input type="text" value="a4" id="a4"><br/>
<input type="text" value="a5" id="a5"><br/>
<input type="button" value="点击测试" οnclick="test_()">
</body>
<script>
function test_() {
var a1=$("#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.
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