为什么indexOf在Internet Explorer中不起作用?

问题描述

此函数在表单onSubmit期间执行，并且在Firefox和Chrome中运行正常，但在IE中则无法正常运行.我怀疑它是indexOf，但是我似乎找不到找到使它正常工作的方法.

This function executes during the forms onSubmit, and works fine in Firefox and Chrome, but not in IE. I suspect it's indexOf, but I cannot seem to find a way to get it to work.

function checkSuburbMatch(e) {

var theSuburb = document.getElementById('suburb').value;
var thePostcode = document.getElementById('postcode').value;

var arrayNeedle = theSuburb + " (" + thePostcode + ")";

if(suburbs.indexOf(arrayNeedle) != -1) {
    alert("Suburb and Postcode match!");
    return false;
} else {
    alert("Suburb and Postcode do not match!");
    return false;
}

}

推荐答案

IE在数组，但是您可以自己添加它， :

IE simply doesn't have this method on Array, you can add it yourself though, from MDC:

if (!Array.prototype.indexOf)
{
  Array.prototype.indexOf = function(elt /*, from*/)
  {
    var len = this.length >>> 0;

    var from = Number(arguments[1]) || 0;
    from = (from < 0)
         ? Math.ceil(from)
         : Math.floor(from);
    if (from < 0)
      from += len;

    for (; from < len; from++)
    {
      if (from in this &&
          this[from] === elt)
        return from;
    }
    return -1;
  };
}

如果缺少.indexOf()，这会添加.indexOf()(这时表示您在IE< 9中)，然后就可以使用它了.至于为什么甚至IE8都没有呢?我不能在那帮你...

This adds .indexOf() if it's missing (at this point that means you're in IE<9) then you can use it. As for why even IE8 doesn't have this already? I can't help you there...

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