javascript - 通过字符串到达​​嵌套方法的最佳方法

Question

我想以编程方式访问嵌套在对象中的方法。

var app = {
    property:{
        method:function(){},
        property:"foo"
    }    
}

通常你会像这样访问它:app.property.method

但在我的例子中，在运行时我得到一个字符串，我想将其插入到调用 method 函数中

现在，当我有以下字符串时，如何以编程方式访问 method

"app.property.method"       

有关引用，请参阅: http://jsfiddle.net/adardesign/92AnA/

Answer 1

前一段时间我写了这个小脚本来从描述其路径的字符串中获取一个对象:

(function () {
    "use strict";
    if (!Object.fromPath) {
        Object.fromPath = function (context, path) {
            var result,
                keys,
                i;
            //if called as `Object.fromPath('foo.bar.baz')`,
            //assume `window` as context
            if (arguments.length < 2) {
                path = context;
                context = window;
            }
            //start at the `context` object
            result = context;
            //break the path on `.` characters
            keys = String(path).split('.');
            //`!= null` is being used to break out of the loop
            //if `null` or `undefined are found
            for (i = 0; i < keys.length && result != null; i+= 1) {
                //iterate down the path, getting the next part
                //of the path each iteration
                result = result[keys[i]];
            }
            //return the object as described by the path,
            //or null or undefined if they occur anywhere in the path
            return result;
        };
    }
}());