4-async与awita结合发送AJAX请求
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<button id="btn">点击获取段子</button>
<script>
function sendAJAX(url) {
return new Promise((resolve, reject) => {
let xhr = new XMLHttpRequest();
xhr.responseType = "json";
xhr.open("GET", url);
xhr.send();
xhr.onreadystatechange = function () {
if (xhr.readyState == 4) {
if (xhr.status >= 200 && xhr.status < 300) {
resolve(xhr.response);
} else {
reject(xhr.status);
}
}
};
});
}
let btn = document.querySelector("#btn");
btn.addEventListener("click", async function () {
// 获取段子信息
let jokes = await sendAJAX("https://api.apiopen.top/getJoke");
console.log(jokes);
});
</script>
</body>
</html>
