javascript - 循环遍历 JavaScript 中的对象

Question

我有一个像

{ a: 2.078467321618,
  b :13521.4,
  c : 4503.9,
  more...}

（在调试模式下）

我想遍历对象并分离键和值；我怎样才能做到这一点？

Answer 1

Object.keys(obj).forEach(function(key) {
    var val = obj[key];
    ...
});

Answer 2

另一种方法是通过 foreach 实现：

for (var key in obj) {
    if (obj.hasOwnProperty(key)) {
        // do something with the key and obj[key], which is val
    }
}

注意：这里我们通过方法检查键是否属于我们的对象，而不是它的原型hasOwnProperty。

Answer 3

Try the following:

for(var key in object){
    var value = object[key];
    //now you have access to "key" and "value"
}

Answer 4

尝试这样的事情

for(var key in object){
    alert(key);// will give key
    alert(object[key]);// will give value
}

Answer 5

其实很简单：

for (var key in object) {
   // do something with object[key]
}

Answer 6

尝试这个

var sum = 0;
var obj = {prop1: 5, prop2: 10, prop3: 15};

for each (var item in obj)
{
 sum += item;
}

结果是总和 = 5+10+15

Answer 7

试试下面的代码：

var keys=Array();
var values = Array();

for (var key in obj) {
//has own property is checked to bypass inherited properties like prototype    
if (obj.hasOwnProperty(key)) {
    keys.push(key)';
    values.push(obj[key]);

    }
}

//以下是分开的键和值，对它们做任何你想做的事情

console.log(keys);
console.log(values);

Answer 8

使用jQuery：

var obj = { a: 2.078467321618, b :13521.4, c : 4503.9 };
var keyArr = [];
var valArr = [];

//iterate obj
$.each(obj, function(k, v) {
    //add items to the keyArr from obj's keys.
    keyArr.push(k);
    //add items to the varArr from obj's keys.
    valArr.push(v);
});

//show the result
alert(keyArr);
alert(valArr);

看演示：http: //jsfiddle.net/bauangsta/KdZrA/