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打破窗户,通过多种参数
原标题:Overriding window.alert and passing multiple parameters

我试图推翻这一窗口。 注意通过多个参数。

请解释我为什么要继承。 Array.prototype.tester s Body into list?

非常感谢。

Array.prototype.tester = function() {
    return  tester ;
}

window.alert = function() {
    var args = Array.prototype.slice.call(arguments);
    var list = [];

    for (var i in args) {
        list.push(args[i]);
    }

    return list.join( ,  ); // WHY???? alerts: "arg1, arg2, function () { return "tester"; }"
    //return args.join( ,  ); // alerts: "arg1, arg2" expected.
}

alert( arg1 ,  arg2 );
最佳回答

,for in Iterates over nature specified by yourself that are in the Object chain.

为确定这一点,使用hasOwnProperty(

for (var i in args) {
    if (args.hasOwnProperty(i)) {
        list.push(args[i]);
    }
}
问题回答

。 大多数已建职能被宣布为不可计数,因此在正常运转期间没有出现。 ECMA 成文5允许你将自己的财产定义为不可计数的,尽管我不敢确定哪些浏览者支持:

function testerFunc() {
  return  tester ;
}

Object.defineProperty(Array.prototype,  tester , {
  value: testerFunc,
  writable: true,
  enumerable: false,
  configurable: true
});

www.un.org/Depts/DGACM/index_french.htm

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