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JS filters out Chinese and English and counts characters

php中世界最好的语言Original: 2018-06-12 09:38:561729browse

This time I will bring you JS to filter out Chinese and English characters and count characters. What are the precautions for JS to filter out Chinese and English characters and count characters? The following is a practical case, let’s take a look.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>js区分中英文统计字符个数</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel=" rel="external nofollow" stylesheet">
</head>
<body>
  <input type="text" value="" id="str"><span id="showcontent"></span><!-- 此处原来使用的label标签，但是设置其innerHTML的值在ie8上报错，故换为span标签 -->
  <script type="text/javascript">
  var countnums=(function(){
    var trim=function(strings){
      return (strings||"").replace(/^(\s|\u00A0)+|(\s|\u00A0)+$/g,"");//+表示匹配一次或多次，|表示或者，\s和\u00A0匹配空白字符，/^以……开头，$以……结尾，/g全局匹配,/i忽略大小写
    }
    return function(_str){
      _str=trim(_str);  //去除字符串的左右两边空格
      var strlength=_str.length;
      if(!strlength){  //如果字符串长度为零，返回零
        return 0;
      }
      var chinese=_str.match(/[\u4e00-\u9fa5]/g); //匹配中文，match返回包含中文的数组
      return strlength+(chinese?chinese.length:0); //计算字符个数
    }
  })();
  function count(tThis){
    var charnum=countnums(tThis.value)
      var showid=document.getElementById("showcontent");
      showid.innerHTML="您总共输入了"+charnum+"个字符";
  }
  window.onload=function(){
    var str=document.getElementById("str");
    str.onkeypress=function(){
      count(this);
    }
    str.onkeyup=function(){
      count(this);
    }
  }
  </script>
</body>
</html>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

JS filters out Chinese and English and counts characters

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