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实例演示 fetch / async / await 的使用场景
<!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>fetch/async/await</title></head><body><script>fetch("https://jsonplaceholder.typicode.com/todos/5").then(function (response) {return response.json();}).then(function (json) {console.log(json);});/*** 1. fetch(url): promise* 2. then: 调用响应对象的方法生成JSON数据(response.json())* 3. then: 拿到第二步的响应数据JSON,执行相关操作,例如 DOM*//*** 1. fetch(url): promise* 2. then: (response)=>response.json()* 3. then: (json)=>console.log(json)*/// function 前添加 async , 转为异步函数async function getUser() {let url = "http://site.io/data.php?id=1";// 1. 等待结果再进行下一步操作,返回响应对象const response = await fetch(url);// 2. 将响应结果,转为json, json()const result = await response.json();console.log(result);}</script></body></html>