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

for(var k in validation_messages) {
    var o = validation_messages[k];
    do_something_with(o.your_name);
    do_something_else_with(o.your_msg);
}

其他回答

在ES7中,您可以执行以下操作:

for (const [key, value] of Object.entries(obj)) {
  //
}
for(var k in validation_messages) {
    var o = validation_messages[k];
    do_something_with(o.your_name);
    do_something_else_with(o.your_msg);
}

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>

使用ES8Object.entries()应该是实现这一点的更紧凑的方法。

Object.entries(validation_messages).map(([key,object]) => {

    alert(`Looping through key : ${key}`);

    Object.entries(object).map(([token, value]) => {
        alert(`${token} : ${value}`);
    });
});

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]);
            }
        }
    }
}