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ECMAScript Strict mode

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Author: User
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  1. Undefined as the value of this when the function is called, this does not point to the global object
  2. When an identifier appears in the code, JavaScript looks for its value as a variable, and if the variable name does not exist, the result of the expression operation is undefined. In strict mode, a reference error exception is thrown when a non-existent variable is evaluated
  3. Eval () See 4.12.3
  4. Delete See 4.13.3

Https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode

ECMAScript Strict mode

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