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jquery uses replace to remove spaces

小云云

Jan 12, 2018 am 10:32 AM

jqueryreplacemethod

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= $(&#39;input[name=username]&#39;).val().replace(/(^\s*)|(\s*$)/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>

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