请求端
<body>
<div> hello world</div>
<input type="button" value="ajax">
</body>
<style>
div {
width: 200px;
height: 300px;
border: aquamarine 1px solid;
}
</style>
<script>
let bt = document.querySelector("input");
let mydiv = document.querySelector("div");
bt.onclick = function () {
let xhr = new XMLHttpRequest();
console.log(xhr.readyState);
xhr.open("get", "http://localhost:8000/");
console.log(xhr.readyState);
xhr.send();
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
if (xhr.status >= 200 && xhr.status <= 300) {
console.log("success");
console.log(xhr.status);
console.log(xhr.readyState);
console.log(xhr.statusText);
console.log(xhr.response);
console.log(xhr.getAllResponseHeaders());
mydiv.innerHTML = xhr.response;
}
}
}
}
</script>
服务器端
let express = require("express");
let app1 = express();
app1.get("/", (r, rs) => {
rs.setHeader("Access-Control-Allow-Origin", "*")
rs.send("收到")
})
app1.listen(8000, () => {
console.log(
"8000服务器启动"
);
})
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