3 years ago · 74bfd7939c
--- a/17/ajax.js
+++ b/17/ajax.js
@@ -0,0 +1,14 @@
 
				+const p = new Promise((resolve,reject)=>{
			
 
				+    const xhr = new XMLHttpRequest()
			
 
				+    xhr.open("GET","https://api.apiopen.top/getJoke")
			
 
				+    xhr.send()
			
 
				+    xhr.onreadystatechange = function(){
			
 
				+        if(xhr.readyState === 4){
			
 
				+            if(xhr.status >= 200 && xhr.status < 300){
			
 
				+                resolve(xhr.response)
			
 
				+            }else{
			
 
				+                reject(xhr.status)
			
 
				+            }
			
 
				+        }
			
 
				+    }
			
 
				+})
			
--- a/17/index.html
+++ b/17/index.html
@@ -0,0 +1,47 @@
 
				+<!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>
			
 
				+        // const p = new Promise(function(resolve,reject){
			
 
				+        //     setTimeout(function(){
			
 
				+        //         let data = 'user data'
			
 
				+        //         resolve(data)
			
 
				+        //     },1000)
			
 
				+        //     reject('err');
			
 
				+        // })
			
 
				+
			
 
				+        // p.then(function(value){
			
 
				+        //     console.log(value)
			
 
				+        // },function(reason){
			
 
				+        //     console.log(reason)
			
 
				+        // })
			
 
				+        const p = new Promise((resolve,reject)=>{
			
 
				+            const xhr = new XMLHttpRequest()
			
 
				+            xhr.open("GET","https://api.apiopen.top/getJoke")
			
 
				+            xhr.send()
			
 
				+            xhr.onreadystatechange = function(){
			
 
				+                if(xhr.readyState === 4){
			
 
				+                    if(xhr.status >= 200 && xhr.status < 300){
			
 
				+                        resolve(xhr.response)
			
 
				+                    }else{
			
 
				+                        reject(xhr.status)
			
 
				+                    }
			
 
				+                }
			
 
				+            }
			
 
				+        })
			
 
				+        p.then(function(value){
			
 
				+            console.log(value)
			
 
				+        },function(reason){
			
 
				+            console.log(reason)
			
 
				+        })
			
 
				+        
			
 
				+
			
 
				+    </script>
			
 
				+</body>
			
 
				+</html>
			
--- a/17/index.js
+++ b/17/index.js
@@ -0,0 +1,63 @@
 
				+//读取text.md
			
 
				+const fs = require('fs')
			
 
				+
			
 
				+// fs.readFile('./resources/text.md',(err,data)=>{
			
 
				+//     if(err) throw err
			
 
				+//     console.log(data.toString())
			
 
				+// })
			
 
				+
			
 
				+//使用promise封装
			
 
				+const p = new Promise(function(resolve,reject){
			
 
				+    fs.readFile('./resources/text.md',(err,data)=>{
			
 
				+        if(err) reject('失败')
			
 
				+        resolve(data)
			
 
				+    })
			
 
				+})
			
 
				+// p.then(function(value){
			
 
				+//     console.log(value.toString())
			
 
				+// },function(err){
			
 
				+//     console.log(err)
			
 
				+// })
			
 
				+
			
 
				+// p
			
 
				+// .then(function(value){
			
 
				+//     console.log(value.toString())
			
 
				+// })
			
 
				+// .catch(function(err){
			
 
				+//     console.log(err)
			
 
				+// })
			
 
				+
			
 
				+//多个文件内容读取 -- 回调地狱
			
 
				+// fs.readFile('./resources/text.md',(err,data1)=>{
			
 
				+//     fs.readFile('./resources/text1.md',(err,data2)=>{
			
 
				+//         fs.readFile('./resources/text2.md',(err,data3)=>{
			
 
				+//             let result = data1 + data2 + data3
			
 
				+//             console.log(result)
			
 
				+//         })
			
 
				+//     })
			
 
				+// })
			
 
				+
			
 
				+//使用promise实现
			
 
				+const p1 = new Promise((resolve,reject)=>{
			
 
				+    fs.readFile('./resources/text.md',(err,data)=>{
			
 
				+        resolve(data)
			
 
				+    })
			
 
				+})
			
 
				+
			
 
				+p1.then(value=>{
			
 
				+    return new Promise((resolve,reject)=>{
			
 
				+        fs.readFile('./resources/text1.md',(err,data)=>{
			
 
				+            resolve([value,data])
			
 
				+        })
			
 
				+    })
			
 
				+}).then(value =>{
			
 
				+    return new Promise((resolve,reject)=>{
			
 
				+        fs.readFile('./resources/text2.md',(err,data)=>{
			
 
				+            value.push(data)
			
 
				+            resolve(value)
			
 
				+        })
			
 
				+    })
			
 
				+}).then(value=>{
			
 
				+    console.log(value.join('\r\n'))
			
 
				+})
			
 
				+
			
--- a/17/resources/text.md
+++ b/17/resources/text.md
@@ -0,0 +1,3 @@
 
				+成功乃失败之母
			
 
				+你好 世界
			
 
				+我名由我不由天
			
--- a/17/resources/text1.md
+++ b/17/resources/text1.md
@@ -0,0 +1 @@
 
				+test1
			
--- a/17/resources/text2.md
+++ b/17/resources/text2.md
@@ -0,0 +1 @@
 
				+test2
			
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@
 
				 * 14 迭代器
			
 
				 * 15 生成器函数
			
 
				 * 16 生成器函数实例
			
 
				+* 17 promise
			
 
				 
			
 
				 ## 运行说明
			
 
				     npm i