[feat] 更新 record

docs/blog/_meta.json

@@ -4,6 +4,11 @@
     "name": "index",
     "label": "原创笔记"
   },
+  {
+    "type": "dir",
+    "name": "list",
+    "label": "一点记录"
+  },
   {
     "type": "file",
     "name": "taro_3",

docs/blog/list/magicai.md

@@ -0,0 +1,56 @@
+
+# 0902面试总结
+
+## 手写题
+
+1. usePrevious
+
+```typescript
+import { useEffect, useRef } from 'react';
+
+export default function usePrevious<T>(state: T): T | undefined {
+  const ref = useRef<T>();
+
+  useEffect(() => {
+    ref.current = state;
+  }, [state]);
+
+  return ref.current;
+}
+```
+
+2. LazyMan 类实现
+
+```javascript
+
+class LazyMan {
+  constructor(name) {
+    this.name = name;
+    console.log(name);
+
+    this.base = Promise.resolve()
+  }
+
+  sleep (time) {
+    this.base = this.base.then(() => {
+      return new Promise((resolve) => {
+        console.log(`等待${time}秒`)
+        setTimeout(() => {
+          resolve()
+        }, time * 1000);
+      })
+    })
+    return this;
+  }
+
+  eat (food) {
+    this.base = this.base.then(() => {
+      console.log(`正在吃${food}`)
+    })
+    return this;
+  }
+}
+
+new LazyMan('张三').eat('banana').sleep(3).eat('launch').sleep(4).eat('food');
+
+```