触发即将被替换的对象的方法

发布于 2024-12-22 05:41:03 字数 331 浏览 3 评论 0原文

给定这个 var：

somevar = {dothis: function(){console('yay')}};

如果我想劫持它，我想我会做类似的事情：

tempvar = somevar;
somevar = function(){ console.log('yoink'); tempvar();};

但是如果我知道 var 将在 60 秒内重新定义，并且我想在 65 秒内劫持它，我该怎么做这样做吗？ setTimeout 不会立即解析该函数，然后引用旧的被劫持的函数吗？

提前致谢。

原文

Given this var:

somevar = {dothis: function(){console('yay')}};

If I want to hijack it, I would think i'd do something like:

tempvar = somevar;
somevar = function(){ console.log('yoink'); tempvar();};

But if I know that the var is going to be redefined in 60 seconds, and I want to hijack it in 65 seconds, how do I do that? Wouldn't a setTimeout parse the function immediately, and then refer to the old hijacked function?

Thanks in advance.

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血之狂魔 2024-12-29 05:41:03

尝试这样的事情：

// initial data
var somevar = {
  dothis: function(){
    console.log('yay');
  }
};

somevar.dothis(); // output: yay

// hijacking in 1 second
setTimeout(function () {
    console.log('hijacking');
    somevar.dothis = (function (orig) {
        return function () {
            console.log('yoink');
            orig.apply(this, arguments);
        };
    }(somevar.dothis));
}, 1000);

// saved reference running 1.5 seconds later (0.5 seconds after hijacking)
setTimeout(somevar.dothis, 1500); // output (still): yay

// live reference running 2 seconds later (1 second after hijacking)
setTimeout(function () {
  somevar.dothis(); // output: yoink / yay
}, 2000);

演示： http://jsfiddle.net/MDLZt/

Try something like this:

// initial data
var somevar = {
  dothis: function(){
    console.log('yay');
  }
};

somevar.dothis(); // output: yay

// hijacking in 1 second
setTimeout(function () {
    console.log('hijacking');
    somevar.dothis = (function (orig) {
        return function () {
            console.log('yoink');
            orig.apply(this, arguments);
        };
    }(somevar.dothis));
}, 1000);

// saved reference running 1.5 seconds later (0.5 seconds after hijacking)
setTimeout(somevar.dothis, 1500); // output (still): yay

// live reference running 2 seconds later (1 second after hijacking)
setTimeout(function () {
  somevar.dothis(); // output: yoink / yay
}, 2000);

demo: http://jsfiddle.net/MDLZt/

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