数字和符号的验证????

Question

<script>
alert(/^[,0-9]+$/.test("123"))
alert(/^[,0-9]+$/.test("12,3"))
alert(/^[,0-9]+$/.test("123a"))
alert(/^[,0-9]+$/.test("123,"))
</script>

Answer 1

<input type="text" onpropertychange='this.value=this.value.replace(/[^,0-9]/g,"")' oninput='this.value=this.value.replace(/[^,0-9]/g,"")'>

Answer 2

<input type="text" onpropertychange='this.value=this.value.replace(/[^,0-9]/g,"")' oninput='this.value=this.value.replace(/[^,0-9]/g,"")'>

Answer 3

<script>
function aa(a){
   if(/[^,0-9]/g.test(a.value)){
      a.value=a.value.replace(/[^,0-9]/g,"")
   }
}
</script>
<input type="text" onpropertychange='aa(this)' oninput='this.value=this.value.replace(/[^,0-9]/g,"")'>估计是死循环了

Answer 4

参考
<input name="expenses" type="text" onKeyPress="return Checknumber(1,event);"/>
function Checknumber(ActionFlag,event)
{
var key = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;

switch (ActionFlag)
{
case 1 ://允许小数
if(key>=48&&key<=57||key==46||key==8){return true;}else{return false;}
break;
case 2 ://允许负数
if(key>=48&&key<=57||key==45||key==8){return true;}else{return false;}
break;
case 3 ://只允许正整数
if(key>=48&&key<=57||key==8){return true;}else{return false;}
break;
default :
return true;
} 
}