【阮一峰】try catch

1https://wangdoc.com/javascript/features/error.html

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• let a = 1
  const test = () => {
      a = 2;
      
      throw new Error('给三失败'); // 抛出错误
      a = 3;
      
      a = 4;
  }
  
  test();
  console.log(a);

• let a = 1
  const testTryCatch = () => {
      a = 2;
      
      try {
          throw new Error('给三失败'); // 抛出错误
          a = 3;
      } catch (e) {
          console.log(e);
      }
      
      a = 4;
  }
  
  testTryCatch();
  console.log(a);