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JS 输入字数判断实现代码

<!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>判断输入的字数</title> 
<img src="/_New/_cj/myeditor/sysimage/space.gif" class="ewebeditor__script" _ewebeditor_fake_tag="script" _ewebeditor_fake_value="%3Cscript%20type%3D%22text%2Fjavascript%22%3E%3C!--%20%0D%0Afunction%20Checkval()%20%0D%0A%7B%20%0D%0Avar%20s%3Ddocument.getElementById(%22Text1%22).value%3B%20%0D%0Avar%20n%3D0%3B%20%0D%0Afor(var%20i%3D0%3Bi%3Cs.length%3Bi%2B%2B)%20%0D%0A%7B%20%0D%0A%2F%2FcharCodeAt()%E5%8F%AF%E4%BB%A5%E8%BF%94%E5%9B%9E%E6%8C%87%E5%AE%9A%E4%BD%8D%E7%BD%AE%E7%9A%84unicode%E7%BC%96%E7%A0%81%2C%E8%BF%99%E4%B8%AA%E8%BF%94%E5%9B%9E%E5%80%BC%E6%98%AF0-65535%E4%B9%8B%E9%97%B4%E7%9A%84%E6%95%B4%E6%95%B0%20%0D%0Aif(s.charCodeAt(i)%3C128)%20%0D%0A%7B%20%0D%0An%2B%2B%3B%20%0D%0A%7D%20%0D%0Aelse%20%0D%0A%7B%20%0D%0An%2B%3D3%3B%20%0D%0A%7D%20%0D%0A%7D%20%0D%0Aalert(n)%3B%20%0D%0A%7D%20%0D%0A%2F%2F%20--%3E%3C%2Fscript%3E"> 
</head> 
<body> 
<input id="Text1" type="text" onblur="Checkval()" /> 
</body> 
</html>

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