Question

我正在尝试交换对象的键和值。我在js小提琴上写了代码请查看link

没有输出我正在使用以下写代码来html

 document.getElementById("demo").innerHTML = out;

有人可以告诉我我在哪里弄错了吗？

Answer 1

你有几个错误。我这样修理你的小提琴：

var out='';
var car = {type:"Fiat", model:500, color:"white"};

// BUG #2 -- argument should be obj here not car as you use obj as variable inside
var invert = function (obj) {

  var new_obj = {};

  for (var prop in obj) {
    if(obj.hasOwnProperty(prop)) {
        var value = obj[prop];
      new_obj[value] = prop;
    }
  }

  // BUG #3 need to return the new_obj  
  return new_obj;
};


// BUG #1 -- need to pass car to invert() here! 
for (var value in invert(car)) {
  out += value + ' ';
}
document.getElementById("demo").innerHTML = out;

JSFiddle：http://jsfiddle.net/o1dcaw8j/2/

在javascript中交换Object的键值

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