<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<script >
function trim(str){
if(str.charAt(0) == " "){
str = str.slice(1);
str = trim(str);
}
return str;
}function jiancha(){
var aa=trim(document.testform.testtxt.value);
if( aa==""){
alert('全部是空格');
}
}
</script>
<BODY>
<form name=testform >
<input type="text" name="testtxt" >
<input type="button" value="检查" onclick="jiancha()">
</form>
</BODY>
</HTML>
if len(document.testform.testtxt.value)<>0 then
if len(trim(document.testform.testtxt.value))=0 then
response.write "全为空格"
end if
end if</script>
aa=a.value.replace(/ | /g,"")然后用
aa.length
就可以判断是否有东西了!
alert("全是空格!");