如何循环遍历JavaScript对象中的所有成员，包括作为对象的值？
例如，我如何循环（分别访问“your_name”和“your_message”）？
var validation_messages = {
"key_1": {
"your_name": "jimmy",
"your_msg": "hello world"
},
"key_2": {
"your_name": "billy",
"your_msg": "foo equals bar"
}
}
当前回答
一个月前刚刚完成的ECMAScript 2017引入了Object.values（）。现在您可以这样做了：
let v;
for (v of Object.values(validation_messages))
console.log(v.your_name); // jimmy billy
其他回答
使用lodash_.forEach：
_.forEach（｛“a”：1，“b”：2｝，函数（值，键）{console.log（键，值）；});<script src=“https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js“></script>
AgileJon答案的优化和改进版本：
var key, obj, prop, owns = Object.prototype.hasOwnProperty;
for (key in validation_messages ) {
if (owns.call(validation_messages, key)) {
obj = validation_messages[key];
for (prop in obj ) {
// Using obj.hasOwnProperty might cause you headache if there is
// obj.hasOwnProperty = function(){return false;}
// but 'owns' will always work
if (owns.call(obj, prop)) {
console.log(prop, "=", obj[prop]);
}
}
}
}
每个2
（在此处找到）：
var lunch = {
sandwich: 'ham',
age: 48,
};
lunch.forEach2(function (item, key) {
console.log(key);
console.log(item);
});
代码：
if (!Object.prototype.forEach2) {
Object.defineProperty(Object.prototype, 'forEach2', {
value: function (callback, thisArg) {
if (this == null) {
throw new TypeError('Not an object');
}
thisArg = thisArg || window;
for (var key in this) {
if (this.hasOwnProperty(key)) {
callback.call(thisArg, this[key], key, this);
}
}
}
});
}
我无法得到之前的答案来做我想要的事情。
在玩弄了这里的其他回复之后，我做了这个。它很粗糙，但很管用！
对于此对象：
var myObj = {
pageURL : "BLAH",
emailBox : {model:"emailAddress", selector:"#emailAddress"},
passwordBox: {model:"password" , selector:"#password"}
};
…此代码：
// Get every value in the object into a separate array item ...
function buildArray(p_MainObj, p_Name) {
var variableList = [];
var thisVar = "";
var thisYes = false;
for (var key in p_MainObj) {
thisVar = p_Name + "." + key;
thisYes = false;
if (p_MainObj.hasOwnProperty(key)) {
var obj = p_MainObj[key];
for (var prop in obj) {
var myregex = /^[0-9]*$/;
if (myregex.exec(prop) != prop) {
thisYes = true;
variableList.push({item:thisVar + "." + prop,value:obj[prop]});
}
}
if ( ! thisYes )
variableList.push({item:thisVar,value:obj});
}
}
return variableList;
}
// Get the object items into a simple array ...
var objectItems = buildArray(myObj, "myObj");
// Now use them / test them etc... as you need to!
for (var x=0; x < objectItems.length; ++x) {
console.log(objectItems[x].item + " = " + objectItems[x].value);
}
…在控制台中生成：
myObj.pageURL = BLAH
myObj.emailBox.model = emailAddress
myObj.emailBox.selector = #emailAddress
myObj.passwordBox.model = password
myObj.passwordBox.selector = #password
使用Undercore.js的_.each：
_.each(validation_messages, function(value, key){
_.each(value, function(value, key){
console.log(value);
});
});
