JS内置错误对象

错误对象是一种特殊的基本对象。它们拥有基本的 Error 类型，同时也有多种具体的错误类型

1. Error
2. AggregateError
3. EvalError
4. InternalError
5. RangeError
6. ReferenceError
7. SyntaxError
8. TypeError
9. URIError

   Error

   AggregateError

   EvalError

   InternalError

   RangeError

   ReferenceError

   SyntaxError

   当Javascript语言解析代码时,Javascript引擎发现了不符合语法规范的tokens或token顺序时抛出SyntaxError.

   try {
   eval('hoo bar');
   } catch (e) {
   console.log(e instanceof SyntaxError); // true
   console.log(e.message);                // "missing ; before statement"
   console.log(e.name);                   // "SyntaxError"
   console.log(e.fileName);               // "Scratchpad/1"
   console.log(e.lineNumber);             // 1
   console.log(e.columnNumber);           // 4
   console.log(e.stack);                  // "@Scratchpad/1:2:3\n"
   }

   try {
   throw new SyntaxError('Hello', 'someFile.js', 10);
   } catch (e) {
   console.log(e instanceof SyntaxError); // true
   console.log(e.message);                // "Hello"
   console.log(e.name);                   // "SyntaxError"
   console.log(e.fileName);               // "someFile.js"
   console.log(e.lineNumber);             // 10
   console.log(e.columnNumber);           // 0
   console.log(e.stack);                  // "@Scratchpad/2:11:9\n"
   }

   const func = () =>(return 1)
   // Uncaught SyntaxError: Unexpected token 'return

   TypeError

   URIError

   try catch

   ```javascript function testFinally() { try { return 2; } catch (e) { return 1; } finally { return 0; } }

testFinally() // 返回0 ```