19.请输入整数
<!DOCTYPE html>
<html >
<head lang="en">
<meta charset="UTF-8">
<title>T61-請輸入整數</title>
</head>
<body>
<input type="text" id="num" οnblur="myBlur()" οnfοcus="myFocus()"/>
<p id="p"></p>
</body>
<script type="text/javascript">
var myBlur=function(){
// var reg=/^-?\d+$/;//整數
var reg=/^\d+$/;//正整數
var str=document.getElementById("num").value;
// console.log("檢驗正則"+reg.test(str));
if(isNaN(str)){
document.getElementById("p").innerHTML="請輸入數字";
document.getElementById("num").value="";
}else if(!reg.test(str)){
document.getElementById("p").innerHTML="請輸入整數";
document.getElementById("num").value="";
}else{
document.getElementById("p").innerHTML="輸入正確";
}
}
var myFocus= function () {
document.getElementById("p").innerHTML="";
}
</script>
</html>
<html >
<head lang="en">
<meta charset="UTF-8">
<title>T61-請輸入整數</title>
</head>
<body>
<input type="text" id="num" οnblur="myBlur()" οnfοcus="myFocus()"/>
<p id="p"></p>
</body>
<script type="text/javascript">
var myBlur=function(){
// var reg=/^-?\d+$/;//整數
var reg=/^\d+$/;//正整數
var str=document.getElementById("num").value;
// console.log("檢驗正則"+reg.test(str));
if(isNaN(str)){
document.getElementById("p").innerHTML="請輸入數字";
document.getElementById("num").value="";
}else if(!reg.test(str)){
document.getElementById("p").innerHTML="請輸入整數";
document.getElementById("num").value="";
}else{
document.getElementById("p").innerHTML="輸入正確";
}
}
var myFocus= function () {
document.getElementById("p").innerHTML="";
}
</script>
</html>
轉載于:https://www.cnblogs.com/mx2036/p/6774618.html
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