javascript 从动态类名创建对象 - JS 中的 ReflectionClass?
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时间:2020-10-25 15:54:04 来源:igfitidea点击:
create object from dynamic classname - ReflectionClass in JS?
提问by kubi
is it possible to do something like this without evil eval:
是否有可能在没有邪恶 eval 的情况下做这样的事情:
var str='MyClass';
eval('new '+str);
i just learned that there's ReflectionClass in PHP... thanks.
我刚刚了解到 PHP 中有 ReflectionClass...谢谢。
回答by Jacob Relkin
You could try this:
你可以试试这个:
var str = "MyClass";
var obj = new window[str];
Here's an example:
下面是一个例子:
function MyClass() {
console.log("constructor invoked");
}
var s = "MyClass";
new window[s]; //logs "constructor invoked"
回答by Mykhaylo Adamovych
Create object (invoke constructor) via reflection:
通过反射创建对象(调用构造函数):
SomeClass = function(arg1, arg2) {
// ...
}
ReflectUtil.newInstance('SomeClass', 5, 7);
and implementation:
和实施:
/**
* @param strClass:
* class name
* @param optionals:
* constructor arguments
*/
ReflectUtil.newInstance = function(strClass) {
var args = Array.prototype.slice.call(arguments, 1);
var clsClass = eval(strClass);
function F() {
return clsClass.apply(this, args);
}
F.prototype = clsClass.prototype;
return new F();
};

