Add Helping with JavaScript

packages/playground-examples/copy/zh/JavaScript/Helping with JavaScript/Errors.ts

@@ -1,38 +1,32 @@
 //// { order: 3, isJavaScript: true }
 
-// By default TypeScript doesn't provide error messaging
-// inside JavaScript. Instead the tooling is focused on
-// providing rich support for editors.
+// 默认情况下，TypeScript 在 JavaScript 内不提供错误消息。
+// 该工具专注于为编辑器提供丰富的支持。
 
-// Turning on errors however, is pretty easy. In a
-// typical JS file, all that's required to turn on TypeScript
-// error messages is adding the following comment:
+// 但是打开错误提示非常容易。在一个典型的 JS 文件中，只需要添加
+// 以下注释即可打开 TypeScript 错误提示。
 
 // @ts-check
 
 let myString = "123";
 myString = {};
 
-// This may start to add a lot of red squiggles inside your
-// JS file. While still working inside JavaScript, you have
-// a few tools to fix these errors.
+// 虽然在一开始可能会在您的 JS 文件中添加很多红色曲线。但是这仍然可以在
+// JavaScript 中正常工作，并且有一些工具可以修复这些错误。
 
-// For some of the trickier errors, which you don't feel
-// code changes should happen, you can use JSDoc annotations
-// to tell TypeScript what the types should be:
+// 对于某些您不想修改代码的棘手的错误，您可以使用 JSDoc 注释来
+// 告诉 TypeScript 类型应该是什么：
 
 /** @type {string | {}} */
 let myStringOrObject = "123";
 myStringOrObject = {};
 
-// Which you can read more on here: example:jsdoc-support
+// 您可以在这里了解更多：example:jsdoc-support
 
-// You could declare the failure unimportant, by telling
-// TypeScript to ignore the next error:
+// 您可以声明下一个错误是不重要的，以让 TypeScript 忽略下一个错误：
 
 let myIgnoredError = "123";
 // @ts-ignore
 myStringOrObject = {};
 
-// You can use type inference via the flow of code to make
-// changes to your JavaScript: example:code-flow
+// 您可以使用代码流进行类型推断来修改您的 JavaScript：example:code-flow

packages/playground-examples/copy/zh/JavaScript/Helping with JavaScript/Quick Fixes.ts

@@ -1,13 +1,11 @@
-// TypeScript provides quick-fix recommendations for
-// common accidents, they show up in your editor based
-// on recommendations.
+// TypeScript 为常见问题提供快速修复的建议，他们会基于这些建议
+// 显示在编辑器中。
 
-// For example TypeScript can provide quick-fixes
-// for typos in your types:
+// 例如，TypeScript 可以提供针对 typo 的快速修复：
 
 const eulersNumber = 2.7182818284
 eulersNumber.toStrang();
-//           ^______^ - select this to see the light build
+//           ^______^ - 选中这里查看效果
 
 class ExampleClass {
   method() {