[function] .apply()导致“预期的JScript对象" IE中的错误 [英] [function].apply() causing "JScript object expected" error in IE

问题描述

下面的代码行导致IE中出现预期的JScript对象"错误:

The following line of code causes a "JScript object expected" error in IE:

hideElements.apply(window, elements);

根据IE，预期的JScript对象"指的是hideElements，该函数使用任意数量的HTML对象作为参数并将其隐藏.

According to IE, the 'expected JScript object' refers to hideElements, which is a function that takes any number of HTML objects as arguments and hide them.

具体地，我通过调用getElementsByTagName检索HTML对象数组，并且我希望将此数组作为函数hideElements的参数列表传递.在这种情况下，JS函数apply()正是我所需要的.我知道我肯定可以用不同的方式编写我的代码，但是由于它可以在Firefox和Chrome上完美运行，并且在技术上是正确的，所以我真的很想知道IE为什么会卡在那里.

Concretely, I retrieve an array of HTML objects via a call to getElementsByTagName, and I would like to pass this array as a list of arguments to the function hideElements. The JS function apply() is exactly what I need in that case. I know I could surely write my code differently, but since this works perfectly on Firefox and Chrome, and is technically correct, I'd really like to know why IE gets stuck there.

我确定在执行该行时:

• window不是null且类型为Window;
• elements不为null，且类型为HTMLCollection；和
• hideElements是一个功能齐全的JS函数(可以完全正常工作，并且在执行上述代码时可以完全加载).

• window is not null and of type Window;
• elements is not null and of type HTMLCollection; and
• hideElements is a fully functional JS function (that works perfectly on its own and that is fully loaded when the code above is executed).

推荐答案

getElementsByTagName返回nodeList. apply期望第二个参数为array.如果将elements转换为真实数组(使用循环)，它应该可以工作.

getElementsByTagName returns a nodeList. apply expects the second argument to be an array. If you convert elements to a real array (using a loop), it should work.

注意:在IE< 9中，不可能使用Array.prototype.slice.call(elements)，因此循环是创建数组的最安全方法，例如:

Note: In IE<9, it's not possible to use Array.prototype.slice.call(elements) for that, so a loop is the safest way to create an array, like:

function nodeList2Array(nodes){
  var arr = [];
  for (var i=1; i<nodes.length;(i+=1)){
    arr.push(nodes[i]);
  }
  return arr;
}

现在:hideElements.apply(window, nodeList2Array(elements));应该可以工作.

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