Add tsc result for template string

Author: xcatliu

basics/primitive-data-types.md

@@ -83,6 +83,15 @@ let sentence: string = `Hello, my name is ${myName}.
 I'll be ${myAge + 1} years old next month.`;
 ```
 
+编译结果：
+
+```js
+var myName = 'Xcat Liu';
+var myAge = 25;
+// 模板字符串
+var sentence = "Hello, my name is " + myName + ".\nI'll be " + (myAge + 1) + " years old next month.";
+```
+
 其中 <code>&#96;</code> 用来定义 [ES2015 中的模板字符串][]，`${expr}` 用来在模板字符串中嵌入表达式。
 
 ## 空值（Void）

examples/playground/index.js

@@ -1,2 +1,4 @@
-var u;
-var num = u;
+var myName = 'Xcat Liu';
+var myAge = 25;
+// 模板字符串
+var sentence = "Hello, my name is " + myName + ".\nI'll be " + (myAge + 1) + " years old next month.";

examples/playground/index.ts

@@ -1,2 +1,6 @@
-let u: void;
-let num: number = u;
+let myName: string = 'Xcat Liu';
+let myAge: number = 25;
+
+// 模板字符串
+let sentence: string = `Hello, my name is ${myName}.
+I'll be ${myAge + 1} years old next month.`;