js determines whether there is a Chinese script_js determines Chinese method collection [original]_javascript skills

The idea of ​​​​judging whether there is Chinese is that there can be any characters before and after, as long as it matches this problem, this problem can be solved, and the code is simple and the idea is clear
The first method of js to judge whether there is Chinese

<form name="form1"> <input type="text" name="txtName"> <input type="button" name="butTxt" value="判断是否是汉字" onclick="funcChina()"> </form>
[Ctrl A Select all Note: If you need to introduce external Js, you need to refresh it to execute

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js to determine whether The second code with Chinese
is a super simple method

Copy the code

The code is as follows:

if (escape(str).indexOf("%u") < 0)
{
//String str contains Chinese characters
}

How does it work? It is escape to encode the string. Character values ​​greater than 255 are stored in %u**** format, and character values ​​greater than 255 happen to be non-English characters (generally Chinese characters, non-Chinese characters can also be considered as Chinese characters) .
IndexOf is used to determine whether a certain substring exists in the string. If not found, it returns -1. js check if all are in Chinese

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title> </title>Chinese js test