属性

• 12.1 访问属性时使用点符号. eslint: dot-notation (opens new window)

  const luke = {
    jedi: true,
    age: 28,
  };
  
  // bad
  const isJedi = luke['jedi'];
  
  // good
  const isJedi = luke.jedi;
  

• 12.2 当获取的属性是变量时用方括号[]取

  const luke = {
    jedi: true,
    age: 28,
  };
  
  function getProp(prop) {
    return luke[prop];
  }
  
  const isJedi = getProp('jedi');
  

• 12.3 做幂运算时用幂操作符 ** 。 eslint: no-restricted-properties (opens new window).

  // bad
  const binary = Math.pow(2, 10);
  
  // good
  const binary = 2 ** 10;
  

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