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async1.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<script type="text/javascript">
function ajax (opt, success) {
opt = opt || {};
opt.method = opt.method || 'get';
opt.url = opt.url || '';
opt.async = opt.async || true;
var xmlHttp = new XMLHttpRequest();
xmlHttp.open(opt.method, opt.url, opt.async);
xmlHttp.send(null);
xmlHttp.onreadystatechange = function() {
if(xmlHttp.readyState === 4 && xmlHttp.status ===200) {
success(xmlHttp.responseText)
}
}
}
// 设置谷歌权限允许跨域file->https
// 日了，不管怎么搞，我这还是不行--disable-web-security --user-data-dir=C:\MyChromeDevUserData
// https://www.cnblogs.com/lyingSmall/p/5198624.html
// https://www.cnblogs.com/laden666666/p/5544572.html
// 还是这个好使
/*
// C:\Users\zhangzs>cd C:\Program Files (x86)\Google\Chrome\Application
C:\Program Files (x86)\Google\Chrome\Application>chrome.exe --disable-web-securi
ty --user-data-dir
*/
ajax({
url:'https://api.douban.com/v2/book/1220562'
},
function(data){
console.log(data)
document.write(data)
})
(async () =>{
await setTimeout(()=>{console.log(111)},50)
await (()=>{console.log(222)})()
await setTimeout(()=>{console.log(333)},100)
})();
console.log('*********前面的分号;还是很有必要的*******');
(async () =>{
await new Promise((resolve, reject) => {
setTimeout(()=>{console.log('await: ',111); resolve()},50)
})
await new Promise((resolve, reject) => {
(()=>{console.log('await: ',222); resolve()})()
})
await new Promise((resolve, reject) => {
setTimeout(()=>{console.log('await: ',333)},1000)
})
})();
console.log('********************************');
(async () =>{
return new Promise((resolve, reject) => {
setTimeout(()=>{console.log('Promise: ',111); resolve()},50)
})
// 连续2个promise出问题 unreachable code after return statement
// return new Promise((resolve, reject) => {
// (()=>{console.log('Promise: ',222); resolve()})()
// })
})();
(async () =>{
return new Promise((resolve, reject) => {
setTimeout(()=>{console.log('Promise2: ',111); resolve()},50)
}).then(() => {
(()=>{console.log('Promise2: ',222)})()
}).then(() => {
setTimeout(()=>{console.log('Promise2: ',333)},1000)
})
})();
async function a () {
return new Promise((resolve, reject) => {
setTimeout(()=>{console.log('Promise3: ',111); resolve()},50)
})
};
a().then(() => {
(()=>{console.log('Promise3: ',222)})()
}).then(() => {
setTimeout(()=>{console.log('Promise3: ',333)},1000)
})
</script>
</body>
</html>