如何用自定义函数替换javascript原型 [英] How to replace javascript prototype with custom function

问题描述

// I am trying to make a clone of String's replace function
// and then re-define the replace function (with a mind to
// call the original from the new one with some mods)
String.prototype.replaceOriginal = String.prototype.replace
String.prototype.replace = {}

下一行现在坏了 - 我该如何修复?

This next line is now broken - how do I fix?

"lorem ipsum".replaceOriginal(/(orem |um)/g,'')

推荐答案

唯一可能的问题是你的代码被执行了两次，导致出现问题:真正的原始 .replace 会消失.

The only possible issue is that your code is executed twice, which causes problems: The real original .replace will disappear.

为避免此类问题，我强烈建议使用以下通用方法替换内置方法:

To avoid such problems, I strongly recommend to replace built-in methods using the following general method:

(function(replace) {                         // Cache the original method
    String.prototype.replace = function() {  // Redefine the method
        // Extra function logic here
        var one_plus_one = 3;
        // Now, call the original method
        return replace.apply(this, arguments);
    };
})(String.prototype.replace);

• 这允许多种方法修改而破坏现有功能
• 上下文由 .apply():通常，this 对象对于(原型)方法至关重要.

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