法（1）：
<html>
<head>
</head>
<body id="body">
<form action="javascript:void(0);" id="exampleForm">
<input type="text" id="examplePass"/>
<input type="submit" />
</form>
</body>
<script>
document.getElementById("exampleForm").onsubmit = function(){
var passwordRegex =/^-?\d*$/;
if(!passwordRegex.test(document.getElementById("examplePass").value)){
console.log("Regex didn't match");
var notify = document.getElementById("notify");
if(notify === null){
notify = document.createElement("p");
notify.textContent = "error character";
notify.id ="notify";
var body =document.getElementById("body");
body.appendChild(notify);
}
}
};
</script>
</html>
法（2）
<html>
<body>
<script>
function f_check_float(obj)
{
if (/^\d+$/.test( obj.value ))
{ alert("輸入為大於等於0的整數字串");
return true;
}
if (/^((-\d+)|(0+))$/.test( obj.value ))
{
alert("輸入的是負整數");
return true;
}
else
{
alert("请输入正确的字串");
return false;
}
}
</script>
<form>
<input name="vvv">
<input type="button" value="檢查字串" onClick="javascript:f_check_float(vvv)"/>
</form>
</body>
</html>
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