Summary of two ways to determine whether a character is a Chinese character in js_javascript skills

Sometimes it is necessary to determine whether a character is a Chinese character. For example, when the user inputs content containing Chinese and English, it needs to be used to determine whether it exceeds the specified length. There are usually two ways to judge using Javascript.

1. Use regular expressions to determine

Copy the code The code is as follows:

　
　
　



 

 

Test character:

　

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2. Use Unicode character range to determine The following method is used to count the length of the input string. If it is a Chinese character, the string length is increased by 2; otherwise, the string length is increased by 1.

Copy code The code is as follows:

function chkstrlen(str)
　{
var strlen = 0;
　for(var i = 0;i < str.length; i )
　　{
　　if(str.charCodeAt(i) > 255) //If it is a Chinese character, then String length plus 2
　strlen = 2;
else