我正在尝试从返回的对象中执行私有(private)函数。如果我提前知道函数的名称,这很容易,但在这种情况下,我不知道有哪些函数可用。我所拥有的是一个字符串,其中包含要调用的函数的名称。有没有办法通过字符串调用这些函数?
function foo() {
// some misc. chunk of valid javascipt code
function bar() {
console.log("hello");
}
// end misc. code
// I would like to avoid doing this if I don't have to
var executableFn = {};
executableFn.test = function() {
bar();
}
// end
return {
// This works but requires I know the name of the funciton ahead of time.
// All I have is a string name of the function to call.
funcRunner0: function() {
bar();
},
// My ideal method for calling but does not work
funcRunner1: function(functionName) {
foo[functionName]();
},
// This works but I'm trying to avoid eval. I'm not sure if this is not so bad
funcRunner2: function(functionName) {
var func = eval(functionName);
func();
},
// This works. I'm not sure if this is worse than funcRunner2 or the same;
funcRunner3: function(functionName) {
eval(functionName + "()");
},
// This works but requires the executableFn object which I would like to avoid if at all possible.
funcRunner4: function(functionName) {
executableFn[functionName]();
},
};
}
var bas = foo();
// This works but assumes I know the name of the function to call which I don't.
bas.funcRunner0();
// This doesn't work
bas.funcRunner1("bar");
// This works
bas.funcRunner2("bar");
// This works
bas.funcRunner3("bar");
// This works but is not my ideal
bas.funcRunner4("test");
这些是我想出的调用此函数的所有方法。你认为我用字符串调用 bar 函数的最佳方式是什么?感谢您的帮助。
最佳答案
My ideal method for calling but does not work
foo[functionName]();
是的,它试图访问 foo
函数的 [public] 属性。例如,它可以与 "call"
方法一起使用。
This works but I'm trying to avoid eval. I'm not sure if this is not so bad
var func = eval(functionName); func();
This works. I'm not sure if this is worse than funcRunner2 or the same;
eval(functionName + "()");
从 eval
的 Angular 来看,两者都一样糟糕。选项 1 只是让使用参数变得更容易 [不需要动态评估]。
This works but requires the exec object which I would like to avoid if at all possible.
exec[functionName]();
这就是实现它的方法。由于 exec
是 foo
范围内的局部变量,您甚至拥有自己的隐私。看来你也为 publicObj
切换了 exec
// I would like to avoid doing this if I don't have to var publicObj = {}; publicObj.test = function() { bar(); }
publicObj
变量,尽管它的名字,不是公开的——它是用 var
关键字声明的局部变量!顺便说一句,您可以将其简化为
var exec = {
test: bar
};
关于javascript - 当我将其名称作为字符串时如何执行私有(private) JavaScript 函数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20722767/