[duyi]171221 try...catch | ES5严格模式

tips.1 try…catch

• try…catch语句将能引发错误的代码放在try块中，并且对应一个响应，然后有异常被抛出。

try {} catch (e) {    console.log(e.name, e.message);} finally {    console.log('over');}

• 常见错误类型

  • EvalError : raised when an error occurs executing code in eval()
  • RangeError : raised when a numeric variable or parameter is outside of its valid range
• ReferenceError : raised when de-referencing an invalid reference
• SyntaxError : raised when a syntax error occurs while parsing code in eval()
• TypeError : raised when a variable or parameter is not a valid type
• URIError : raised when encodeURI() or decodeURI() are passed invalid parameters

tips2.ES5严格模式

• ‘use strict’
• 全局严格模式
• 局部函数内严格模式