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jquery uses replace to remove spaces
- 小云云Original
- 2018-01-12 10:32:541980browse
replace is a very important knowledge point. This article mainly introduces the relevant knowledge of jquery replace method to remove spaces, which has a good reference value. Let's take a look with the editor below, I hope it can help everyone.
Without further ado, please take a look at the code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css"></style>
<script type="text/javascript" src="jquery-3.0.0.js"></script>
</head>
<body>
<p style="width:300px;height:100px;border:1px solid #E5E5E5;margin:0 auto;margin-top:30px;">
<form action="" method="post">
<span>用户名：</span><input type="text" name="username" class="username" value="" />
<input type="submit" value="提交" class="tijiao">
</form>
<script type="text/javascript">
$(document).ready(function(){
$(".tijiao").click(function(){
//var name = $.trim($(".username").val());
var name= $('input[name=username]').val().replace(/(^\s*)|(\s*$)/g,"");
if(name==""){
alert("用户名不能为空");
}
});
});
/*
/(^\s*)|(\s*$)/g 包含以空格、回车符等字符开头或者空格、回车符等字符结尾的字符串，可过滤出所有空格、回车符的字符
/g意思就是：global可选标志，带这个标志表示替换将针对行中每个匹配的串进行，否则则只替换行中第一个匹配串。如：we.fdffddfwe.加上/g后，则2个we都会出来；
\s 空白字符
replace() 方法用于在字符串中用一些字符替换另一些字符，或替换一个与正则表达式匹配的子串。
stringObject.replace(regexp/substr,replacement)
*/
</script>
<p>
</body>
</html> Related recommendations:
Detailed explanation of JS regular replacement method to remove spaces
Usage of space removal function in python
javascript trim Space removal function implementation code_javascript skills
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