正則校驗1-65535的表達式：
複制測試：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
span{
margin-left:20px;
}
</style>
</head>
<body>
<div id="one">
整數輸入校驗(1-65535)<input type="text" id="search" value="">
<button onclick="check()">送出</button>
</div>
<script>
var str = document.createElement("span")
var exp=/^([1-9](\d{0,3}))$|^([1-5]\d{4})$|^(6[0-4]\d{3})$|^(65[0-4]\d{2})$|^(655[0-2]\d)$|^(6553[0-5])$/
function check(){
var val=document.getElementById("search")
str.innerHTML=exp.test(val.value)
setStyle(str,exp.test(val.value))
document.getElementById("one").appendChild(str)
}
function setStyle(dom,bool){
if(bool){
dom.style.color="green"
}else{
dom.style.color="red"
}
}
</script>
</body>
</html>
![原生js放大鏡[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)