<!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>
<script>
//发送ajax请求，返回的结果是一个promise对象
function sendAjax(url){
return new Promise((reslove,reject) => {
//1.创建对象
const x = new XMLHttpRequest();
//2.初始化
x.open('GET',url,true);
//3.发送
x.send();
//4.事件绑定
x.onreadystatechange = function(){
if(x.readyState == 4){
if(x.status>=200 && x.status<=300){
// 成功了
reslove(x.response);
}else{
//返回失败
reject(x.status);
}
}
}
})
}
// Promise then方法的测试
sendAjax('http://api.k780.com/?app=weather.today&weaId=1&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json').then((value) => {
console.log(value);
},(reason) => {
})
async function main(){
//发送请求
let result = await sendAjax('http://api.k780.com/?app=weather.today&weaId=1&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json');
console.log(result);
}
main();
</script>
</body>
</html><!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>
<script>
//发送ajax请求，返回的结果是一个promise对象
function sendAjax(url){
return new Promise((reslove,reject) => {
//1.创建对象
const x = new XMLHttpRequest();
//2.初始化
x.open('GET',url,true);
//3.发送
x.send();
//4.事件绑定
x.onreadystatechange = function(){
if(x.readyState == 4){
if(x.status>=200 && x.status<=300){
// 成功了
reslove(x.response);
}else{
//返回失败
reject(x.status);
}
}
}
})
}
// Promise then方法的测试
sendAjax('http://api.k780.com/?app=weather.today&weaId=1&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json').then((value) => {
console.log(value);
},(reason) => {
})
async function main(){
//发送请求
let result = await sendAjax('http://api.k780.com/?app=weather.today&weaId=1&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json');
console.log(result);
}
main();
</script>
</body>
</html>
