feat

Author: zhaozhou

code/src/module/demo.ts

@@ -8,3 +8,37 @@ class Person {
   }
 }
 export default Person;
+
+function name(params:string = '123') {
+  return params;
+  
+}
+function name1 (a = 1) {
+  return a;
+  
+
+}
+
+const b = name1()
+
+function bbb(){
+
+}
+const bb: (a:number, b:number) => number = (a, b) => {
+  return a+b;
+}
+
+
+function getLength(n: number): number;
+function getLength(n: string): number;
+function getLength(n: object):number;
+function getLength(n: []): number;
+function getLength (n: any): number {
+  if(typeof n === 'number'){
+    return 0
+  }
+  if(typeof n === 'string'){
+    return n.length;
+  }
+  return n.length
+}

new/docs/typescript/1.ts

@@ -23,4 +23,14 @@ const fn3:(a:number, b?: number) => number = (a, b) => {
 
       return a + (<number> b);
 }
-// fn1(1,2);
+// fn1(1,2);
+
+type fn = (o: any, k: any) => any
+const getProperty=  <T, K extends keyof T>(o:T ,k: K): T[K] => {
+     
+      return o[k]
+}
+
+const obj = { age: 12, get:() => {}, name: new Map()}
+const a = getProperty(obj, 'name')
+

new/docs/typescript/function.md

@@ -1,5 +1,6 @@
 # 函数
 
+# ## 函数定义
 
 1. 匿名函数
 
@@ -11,6 +12,7 @@ const fn1 = function (m: number, n: number) {
 ```
 
 2. 命名函数
+
 ```typescript
 function fn2 (m: number, n: number) {
       return m + n;
@@ -19,12 +21,14 @@ function fn2 (m: number, n: number) {
 ```
 
 3. 箭头函数
+
 ```typescript
 function fn2 (m: number, n: number) {
       return m + n;
 }
 
 ```
+
 ## 函数接口
 
 ```typescript
@@ -46,5 +50,13 @@ const mySalary2: IMoney = function (a, b) {
 mySalary2(1,2);
 ```
 
+## 函数重载
+
+>  函数名相同 入参不同 返回值可以相同也可以不同
 
-```
+```typescript
+function isMe(age: number): void;
+function isMe(name: string): void;
+
+
+```