GitBook: [master] one page modified

Author: TYRMars

09/promise.md

@@ -1,2 +1,35 @@
+---
+description: Promise 使用
+---
+
 # Promise
 
+## Promise简介
+
+Promise 对象用于表示一个异步操作的最终完成（或失败）及其结果值
+
+```javascript
+const myFirstPromise = new Promise((resolve, reject) => {
+  // ?做一些异步操作，最终会调用下面两者之一:
+  //
+  //   resolve(someValue); // fulfilled
+  // ?或
+  //   reject("failure reason"); // rejected
+});
+```
+
+{% hint style="info" %}
+ promise.finally\(\) 要注意浏览器兼容性
+{% endhint %}
+
+## Promise原型
+
+{% code title="hello.sh" %}
+```bash
+# Ain't no code for that yet, sorry
+echo 'You got to trust me on this, I saved the world'
+```
+{% endcode %}
+
+
+