使用 jQuery 迭代 JavaScript 对象的属性

是否有一种 jQuery 方法来对对象的成员执行迭代,例如:

    for (var member in obj) {
...
}

我只是不喜欢这个 for从我可爱的 jQuery 符号中脱颖而出!

109718 次浏览
$.each( { name: "John", lang: "JS" }, function(i, n){
alert( "Name: " + i + ", Value: " + n );
});

每个人

你也可以将 each用于对象,而不仅仅是数组:

var obj = {
foo: "bar",
baz: "quux"
};
jQuery.each(obj, function(name, value) {
alert(name + ": " + value);
});

注意: 大多数现代浏览器现在都允许您在开发者控制台中导航对象。

此方法将遍历对象属性并将它们写入控制台,并使用增加的缩进:

function enumerate(o,s){


//if s isn't defined, set it to an empty string
s = typeof s !== 'undefined' ? s : "";


//if o is null, we need to output and bail
if(typeof o == "object" && o === null){


console.log(s+k+": null");


} else {


//iterate across o, passing keys as k and values as v
$.each(o, function(k,v){


//if v has nested depth
if(typeof v == "object" && v !== null){


//write the key to the console
console.log(s+k+": ");


//recursively call enumerate on the nested properties
enumerate(v,s+"  ");


} else {


//log the key & value
console.log(s+k+": "+String(v));
}
});
}
}

只需将要迭代的对象传递给它:

    var response = $.ajax({
url: myurl,
dataType: "json"
})
.done(function(a){
console.log("Returned values:");
enumerate(a);
})
.fail(function(){ console.log("request failed");});

晚了,但可以通过使用 Object.keys来完成,

var a={key1:'value1',key2:'value2',key3:'value3',key4:'value4'},
ulkeys=document.getElementById('object-keys'),str='';
var keys = Object.keys(a);
for(i=0,l=keys.length;i<l;i++){
str+= '<li>'+keys[i]+' : '+a[keys[i]]+'</li>';
}
ulkeys.innerHTML=str;
<ul id="object-keys"></ul>