如何遍歷以對象爲成員的純JavaScript對象？

如何遍歷JavaScript對象中的全部成員，包括對象值。

例如，如何循環瀏覽（分別訪問「 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"
    }
}

---

#1樓

我知道這已經很晚了，可是我花了2分鐘來編寫這個通過優化和改進的AgileJon答案：

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]);
            }

        }

    }

}

---

#2樓

使用_.each的_.each ：

_.each(validation_messages, function(value, key){
    _.each(value, function(value, key){
        console.log(value);
    });
});

---

#3樓

我沒法得到以上職位來作我想作的事情。

在與其餘答覆一塊兒玩耍以後，我作到了。 這很hacky，可是行得通！

對於此對象：

var myObj = {
    pageURL    : "BLAH",
    emailBox   : {model:"emailAddress", selector:"#emailAddress"},
    passwordBox: {model:"password"    , selector:"#password"}
};

...此代碼：

// 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);
}

...在控制檯中產生：

myObj.pageURL = BLAH
myObj.emailBox.model = emailAddress
myObj.emailBox.selector = #emailAddress
myObj.passwordBox.model = password
myObj.passwordBox.selector = #password

---

#4樓

就我而言（在前面的基礎上）能夠是任意數量的級別。

var myObj = {
    rrr: undefined,
    pageURL    : "BLAH",
    emailBox   : {model:"emailAddress", selector:"#emailAddress"},
    passwordBox: {model:"password"    , selector:"#password"},
    proba: {odin:{dva:"rr",trr:"tyuuu"}, od:{ff:5,ppa:{ooo:{lll:'lll'}},tyt:'12345'}}
};


function lookdeep(obj,p_Name,gg){
    var A=[], tem, wrem=[], dd=gg?wrem:A;
    for(var p in obj){
        var y1=gg?'':p_Name, y1=y1 + '.' + p;
        if(obj.hasOwnProperty(p)){
           var tem=obj[p];
           if(tem && typeof tem=='object'){
               a1=arguments.callee(tem,p_Name,true);
               if(a1 && typeof a1=='object'){for(i in a1){dd.push(y1 + a1[i])};}
            }
            else{
               dd.push(y1 + ':' + String(tem));
            }
        }
    };
    return dd
};


var s=lookdeep(myObj,'myObj',false);
for (var x=0; x < s.length; ++x) {
console.log(s[x]+'\n');}

結果：

["myObj.rrr:undefined",
"myObj.pageURL:BLAH",
"myObj.emailBox.model:emailAddress",
"myObj.emailBox.selector:#emailAddress",
"myObj.passwordBox.model:password",
"myObj.passwordBox.selector:#password",
"myObj.proba.odin.dva:rr",
"myObj.proba.odin.trr:tyuuu",
"myObj.proba.od.ff:5",
"myObj.proba.od.ppa.ooo.lll:lll",
"myObj.proba.od.tyt:12345"]

---

#5樓

這個問題

for (var key in validation_messages) {
   var obj = validation_messages[key];
   for (var prop in obj) {
      alert(prop + " = " + obj[prop]);
   }
}

是您還將遍歷原始對象的原型。

有了這個，您將避免：

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]);
         }
      }
   }
}