JS控制<textarea></textarea>的最大输入字符数
<html> <head><title>测试专用页</title> </head> <body><form method=post name=ceshi action="index.htm"> <textarea name=textarea1 onpropertychange=checkMaxLen(this,20,0)></textarea></form> </body><html> <script language=javascript>var oldValue=new Array();function checkMaxLen(obj,maxlength,num){ if(obj.value.length>maxlength){ obj.value=oldValue; } else{ oldValue=obj.value; }} </script>
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