JavaScript 语句 Statement

• Atom
• Expression
• Statement #这里讲的主要是这个 看 ECMA-262 里面就能够很清晰的看到这些JS 的statement
• Structure
• Program/Module

Grammar

简单语句

• Expression Statement 表达式语句
  • a = 1 + 2;
• Empty Statement 空语句
  • ;
• Debugger Statement debugger语句，运行时不产生作用
  • debugger;
• ThrowStatement
  • throw a;
• Continue Statement(与循环相互匹配)
  • continue label1;
• Break Statement(与循环匹配)
  • break label2;
• Return Statement
  • return; / return 1;

组合语句

• Block Statement

{
...
...
}

• Iteration

while()
do...while
for
for...in...
for...of...

声明

• FunctionDeclaration
• GeneratorDeclaration
• AsyncFunctionDeclaration
• AsyncGeneratorDeclaration
• VariableStatemeny
• ClassDeclaration
• LexicalDeclaration

标签、循环、break、continue

• LabelledStatement
• IterationStatement
• ContinueStatement
• BreakStatement
• SwitchStatement

Runtime：

• Complection Record
  • [[type]]: normal, break, continue, return, throw
  • [[value]]: Types
  • [[target]]: label
• Lexical Enviorment(推荐使用前三种)
  • {} . [] Object.defineProperty
  • Object.create Object.setPrototypeOf Object.getPrototypeOf
  • new class extends
  • new function prototype(用这种会被打死)