刚接触正则就被这个玩意儿吸引了，实在是强大。随便写了个验证手机号的代码。
btw：https://regex101.com/这个网站对学习正则真的非常好用。
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>testing</title>
<style>
</style>
</head>
<body>
<label for="phoneNumber">PhoneNumber</label>
<input id="phoneNumber" type="text" name="phoneNumber" placeholder="insert here">
<button type="submit" id="verifyBtn">verify</button>
<button type="reset" id="resetBtn">reset</button>
<label id="info">notification</label>
<script>
var verifyBtn = document.getElementById("verifyBtn");
verifyBtn.addEventListener("click", verify);
var resetBtn = document.getElementById("resetBtn");
resetBtn.addEventListener("click", reset);
function verify(){
var pattern = /^(1.[0-9]{9})$/;
var txt = document.getElementById("phoneNumber").value;
if(pattern.test(txt)){
document.getElementById('info').innerText = "verification passed";
}else{
document.getElementById('info').innerText = "insert your correct phone number please";
document.getElementById("verifyBtn").disabled = true;
}
}
function reset(){
document.getElementById("phoneNumber").value = "";
document.getElementById("verifyBtn").disabled = false;
}
</script>
</body>
</html>
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