好久没更新了

2021-03-23 10:58:10 +08:00
parent eca64f86c0
commit 9bf8e8d020
123 changed files with 24337 additions and 214 deletions
--- a/es6/promise.html
+++ b/es6/promise.html
@@ -0,0 +1,89 @@
+<!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>
+    <!-- <script type="module" src="./b.js"></script> -->
+    <script>
+        // 定义一个 promise 对象
+        // var promise = new Promise(function (resolve, reject) {
+        //     //  resolve 成功状态下调用的函数
+        //     // reject 失败状态下调用的函数
+
+        //     if (成功) {
+        //         resolve()
+        //     } else {
+        //         reject()
+        //     }
+        // })
+        // console.log(promise)
+
+        // // 使用promise 对象
+        // promise.then(function (res) {
+        //     console.log(res)  //成功返回的值
+        // }).catch(function (err) {
+        //     console.log(err)  //失败返回的值
+        // })
+
+
+
+        // function timeout(ms) {
+        //     return new Promise((resolve, reject) => {
+        //         setTimeout(resolve, ms, 'done');
+        //     });
+        // }
+
+        // timeout(100).then((value) => {
+        //     console.log(value);
+        // });
+
+
+
+
+
+        const getJSON = function (url) {
+            const promise = new Promise(function (resolve, reject) {
+                const handler = function () {
+                    if (this.readyState !== 4) {
+                        return;
+                    }
+                    if (this.status === 200) {
+                        resolve(this.response);
+                    } else {
+                        reject(new Error(this.statusText));
+                    }
+                };
+                const client = new XMLHttpRequest();
+                client.open("GET", url);
+                client.onreadystatechange = handler;
+                client.responseType = "json";
+                // client.setRequestHeader("Accept", "application/json");
+                client.send();
+
+            });
+
+            return promise;
+        };
+
+        getJSON("/posts.json").then(function (json) {
+            console.log('Contents: ' + json);
+        }).catch(function(err){
+            console.log(err)
+        });
+
+        
+        async function s(){
+            var list =await getJSON("url")
+            
+        }
+    </script>
+</head>
+
+<body>
+
+</body>
+
+</html>