请教一下简单的问题，关于类型判断的。 - 编程论坛

icecool2010-05-30 17:49

<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<script>
function isNumber(obj){
var i;
strRef = "1234567890.";
for (i=0;i<obj.value.length;i++) {
  tempChar=obj.value.substring(i,i+1);
  if (strRef.indexOf(tempChar,0)==-1) {
   document.getElementById("div1").innerHTML="<font size=2 color=red>请填数字</font>";
   obj.focus();
   return false;
  }
}
return true;
}

</script>
<BODY>
<FORM name="Form1" METHOD=POST ACTION="">
<INPUT TYPE="text" NAME="InputBox" value="" onblur="isNumber(Form1.InputBox)">
<div id=div1 name=div1></div>
</FORM>
</BODY>
</HTML>

gupiao1752010-05-30 21:38

程序代码：

<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<script>
function isNumber(obj){
var re=/\D/;
if(re.test(obj.value))
{document.getElementById("div1").innerHTML="<font size=2 color=red>请填数字</font>";obj.focus();}
else
{document.getElementById("div1").innerHTML="";}
}
</script>
<BODY>
<FORM name="Form1" METHOD=POST ACTION="">
<INPUT TYPE="text" NAME="input" value="" onblur="isNumber(this)">
<span id=div1 name=div1></span>
</FORM>
</BODY>
</HTML>

用正则吧，反正验证数字并不复杂！