let obj = {"a": 3, "b": 2, "6": "a"}

Object.keys(obj).forEach((item) => {console.log("item", obj[item])})

// a
// 3
// 2

jquery允许您立即执行以下操作：

$.each( obj, function( key, value ) {
  alert( key + ": " + value );
});

JavaScript中的对象是财产的集合，因此可以在for-each语句中循环。

您应该将obj视为键值集合。

在ES的最新实现中，您可以使用Object.entries：

for (const [key, value] of Object.entries(obj)) { }

or

Object.entries(obj).forEach(([key, value]) => ...)

如果您只想迭代这些值，请使用Object.values：

for (const value of Object.values(obj)) { }

or

Object.values(obj).forEach(value => ...)

还添加了递归方式：

function iterate(obj) {
    // watch for objects we've already iterated so we won't end in endless cycle
    // for cases like var foo = {}; foo.bar = foo; iterate(foo);
    var walked = [];
    var stack = [{obj: obj, stack: ''}];
    while(stack.length > 0)
    {
        var item = stack.pop();
        var obj = item.obj;
        for (var property in obj) {
            if (obj.hasOwnProperty(property)) {
                if (typeof obj[property] == "object") {
                  // check if we haven't iterated through the reference yet
                  var alreadyFound = false;
                  for(var i = 0; i < walked.length; i++)
                  {
                    if (walked[i] === obj[property])
                    {
                      alreadyFound = true;
                      break;
                    }
                  }
                  // new object reference
                  if (!alreadyFound)
                  {
                    walked.push(obj[property]);
                    stack.push({obj: obj[property], stack: item.stack + '.' + property});
                  }
                }
                else
                {
                    console.log(item.stack + '.' + property + "=" + obj[property]);
                }
            }
        }
    }
}

用法：

iterate({ foo: "foo", bar: { foo: "foo"} }); 

你可以使用Lodash。文件

var obj = {a: 1, b: 2, c: 3};
_.keys(obj).forEach(function (key) {
    ...
});