是的, 并且是es5就已经只支持的.
因为函数和变量一样, 默认是全局变量的子元素, 并且子元素除了用点'.'调用外,还可以用数组方括号[]调用. 区别是方括号内是写字符串的.
如
p = console.log //省字数
function x(){p('x')}
function y(){p('y')}
f = 'x'
这时候, window.x === window['x'] 都是x函数.(在node中window甩global替换) 于是可以这样调用
window[f]() // 输出x
f = 'y'
window[f]() // 输出y
这样执行相同的指令window[f]可以实际执行不同的函数x,y
参考how-to-execute-a-javascript-function-when-i-have-its-name-as-a-string
后面有一个回答很有价值的, 就是将函数的点链式调用写在字符串里面,复制过来,感觉如果和科里化/pointfree结合会很有用, 似乎能创造一种自然语言一般的编程方式.
来自Jason Bunting的回答:
Don't use eval unless you absolutely, positively have no other choice.
As has been mentioned, using something like this would be the best way to do it:
window["functionName"](arguments);
That, however, will not work with a namespace'd function:
window["My.Namespace.functionName"](arguments); // fail
This is how you would do that:
window["My"]["Namespace"]["functionName"](arguments); // succeeds
In order to make that easier and provide some flexibility, here is a convenience function:
function executeFunctionByName(functionName, context /*, args */) {
var args = [].slice.call(arguments).splice(2);
var namespaces = functionName.split(".");
var func = namespaces.pop();
for(var i = 0; i < namespaces.length; i++) {
context = context[namespaces[i]];
}
return context[func].apply(context, args);
}
You would call it like so:
executeFunctionByName("My.Namespace.functionName", window, arguments);
Note, you can pass in whatever context you want, so this would do the same as above:
executeFunctionByName("Namespace.functionName", My, arguments);
如果把上面的My.Namespace.functionName改成My Namespace FunctionName是不是就像是自然语言了?