<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
span {
border: 1px solid black;
padding: 0 40px;
}
</style>
</head>
<body>
<div id="box">
<input type="text" id="mytxt"><span id="veriEle">2340</span>
<button id="btn">验证</button>
</div>
<script>
function loadVeri() {
ajax的get传参
var xhr = null;
try {
xhr = new XMLHttpRequest()
} catch (err) {
xhr = new ActiveXObject("Microsoft.XML")
}
调用open方法
?action=verification
ajax的get传参 在地址栏传参 安全性低
数据量大小有限制 不同浏览器不同 一般4KB左右
传参action=verification
xhr.open("get", "http://127.0.0.1:3000/VueHandler/AdminLoginAndRegHandler?action=verification", true)
发送请求
xhr.send()
等待数据返回
xhr.onreadystatechange = function () {
if (xhr.status == 200 && xhr.readyState == 4) {
console.log(xhr.responseText)
var veri = JSON.parse(xhr.responseText)
console.log(veri)
if (veri.success) { 渲染验证码
var veriEle = document.getElementById("veriEle");
veriEle.innerHTML = veri.data;
}
}
}
}
loadVeri()
校验验证码
var btn = document.getElementById("btn");
btn.onclick = function () {
var mytxtVal = document.getElementById("mytxt").value;输入框中的验证码
var xhr = null;
try {
xhr = new XMLHttpRequest()
} catch (err) {
xhr = new ActiveXObject("Microsoft.XML")
}
调用open用get方式 把验证码传递给后台
xhr.open("get", "http://127.0.0.1:3000/VueHandler/AdminLoginAndRegHandler?action=checkVerification&veri=" + mytxtVal, true)
调用send
xhr.send()
等待数据返回
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
console.log(JSON.parse(xhr.responseText))
}
}
}
</script>