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<head>
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  <title>JS Bin</title>
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var o = {
  m: function(){
    var self = this;
    console.log(this === o);
    f(); // 嵌套函数作为函数调用
    
    function f(){
      console.log(this === o);
      console.log(this); // 全局对象或者undefined
      console.log(self === o);
    }
  }
};
o.m();
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