如何以对象形式传递eval中的参数？

I have this json, and when i get this json i need to run the function which comes at callback object.

我有这个json，当我得到这个json时，我需要运行回调对象的函数。

{
    formId: 'snn_service_item_form',
    item_id: '1',
    item_title: 'some item',
    item_description: '',
    item_duration: '10',
    item_price: '120',
    item_level_1 : 1,
    item_level_2 : 0,
    item_level_3 : 1,
    item_type: 'p',
    callback : {
        callbackName : 'getServices',
        callbackParams : {
            _param1 : 1,
            _param2 : 2 
    } 
} 
}

so according to this i need to run this:

所以根据这个我需要运行这个：

getServices(1,2);

i can do that with eval function like:

我可以用eval函数做到这一点，如：

eval(json.callback.callbackName+'(\''+ json.callback.callbackNParams._param1 +'\',\''+ json.callback.callbackNParams._param2 +'\')');

i can automate this by putting it into a for in and writing parameters to a string, but i dont think this is the best way to go.

我可以通过将其放入for in并将参数写入字符串来自动执行此操作，但我不认为这是最好的方法。

is there a way to assign function name from a var and giving its parameters as an object, in my case like:

有没有办法从var分配函数名称并将其参数作为对象，在我的情况下，如：

json.callback.callbackName(json.callback.callbackParams);

i know this is not the way to do it but it is what i want to learn.

我知道这不是这样做的方式，但这是我想要学习的。

Thanks, Sinan.

谢谢，思南。

2 个解决方案

#1

Depends on where the function to call is defined (global scope or a local scope).

取决于定义要调用的函数的位置（全局范围或本地范围）。

If global, you don't need eval (and it's safer to avoid it), you just reference the function through the global window object:

如果是全局的，则不需要eval（并且避免它更安全），您只需通过全局窗口对象引用该函数：

var args = [];
for(var p in json.callback.callbackParams) {
    args.push(json.callback.callbackParams[p]);
}
window[json.callback.callbackName].apply(null, args)

See the apply() function used above.

请参阅上面使用的apply（）函数。

If it's in a local scope, then you need the eval (how you have it is fine).

如果它在本地范围内，那么你需要eval（如何使用它）。

#2

Don't use eval. You can get a reference to a named global variable or function from the window object:

不要使用eval。您可以从window对象获取对命名全局变量或函数的引用：

var callbackfunction= window[json.callback.callbackName];

And trying to serialise your values to a string just to have them parsed back to JavaScript unreliably is silly. Call the function explicitly:

并尝试将您的值序列化为字符串只是为了让它们不可靠地解析回JavaScript是愚蠢的。明确调用函数：

callbackfunction.call(window, json.callback.callbackParams.param1, json.callback.callbackParams.param2);

(window here is a dummy value for this for when you're not using object methods.)

（当你不使用对象方法时，这里的窗口是一个虚拟值。）

Better for automating it to accept any number of parameters would be to turn callbackParams into a plain Array:

更好的自动化接受任意数量的参数将把callbackParams变成一个普通的数组：

callbackParams: [1, 2]

and then use apply to call the function:

然后使用apply来调用函数：

callbackfunction.apply(window, json.callback.callbackParams);

#1