fix: fix style

JS/JS-ch.md

@@ -446,17 +446,17 @@ var foo = 1
 
 因为当 JS 解释器在遇到非匿名的立即执行函数时，会创建一个辅助的特定对象，然后将函数名称作为这个对象的属性，因此函数内部才可以访问到 `foo`，但是这个值又是只读的，所以对它的赋值并不生效，所以打印的结果还是这个函数，并且外部的值也没有发生更改。
 
->  ```js
-> specialObject = {};
->   
-> Scope = specialObject + Scope;
->   
-> foo = new FunctionExpression;
-> foo.[[Scope]] = Scope;
-> specialObject.foo = foo; // {DontDelete}, {ReadOnly}
->   
-> delete Scope[0]; // remove specialObject from the front of scope chain
-> ```
+ ```js
+specialObject = {};
+
+Scope = specialObject + Scope;
+
+foo = new FunctionExpression;
+foo.[[Scope]] = Scope;
+specialObject.foo = foo; // {DontDelete}, {ReadOnly}
+
+delete Scope[0]; // remove specialObject from the front of scope chain
+```
 
 # 闭包