如何通过一个普通的JavaScript对象与作为成员的对象进行循环？
如何循环JavaScript对象中的所有成员，包括对象的值。
例如，我怎样才能循环访问（为每个访问“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"
}
}
for (var key in validation_messages) {
// skip loop if the property is from prototype
if (!validation_messages.hasOwnProperty(key)) continue;
var obj = validation_messages[key];
for (var prop in obj) {
// skip loop if the property is from prototype
if(!obj.hasOwnProperty(prop)) continue;
// your code
alert(prop + " = " + obj[prop]);
}
}
在ECMAScript 5下，可以结合Object.keys()和Array.prototype.forEach() ：
var obj = {
first: "John",
last: "Doe"
};
//
// Visit non-inherited enumerable keys
//
Object.keys(obj).forEach(function(key) {
console.log(key, obj[key]);
});这个问题
for (var key in validation_messages) {
var obj = validation_messages[key];
for (var prop in obj) {
alert(prop + " = " + obj[prop]);
}
}
你还会循环访问原始对象的原型。
有了这个，你会避免它：
for (var key in validation_messages) {
if (validation_messages.hasOwnProperty(key)) {
var obj = validation_messages[key];
for (var prop in obj) {
if (obj.hasOwnProperty(prop)) {
alert(prop + " = " + obj[prop]);
}
}
}
}
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