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我试图找出如何在 ajax 调用中获取以下代码以在 IE8 及更早版本上运行,但我似乎找不到与 indexOf() 等效的搜索多个字符的方法。我正在尝试复制

    var formKeyLoc = data.indexOf("?f=");
    var tokenLoc = data.indexOf("&token=");
    var endLoc = data.indexOf("'></script>");

我试过 inArray() 但这似乎只寻找一个字符。任何帮助将不胜感激!

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2 回答 2

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这已经被问过好几次了,但是这里(为什么 indexOf 不能在数组 IE8 上工作?)是来自 Mootools 的 polyfill:

if(!Array.prototype.indexOf) {
    Array.prototype.indexOf = function(item, from){
        var length = this.length >>> 0;
        for (var i = (from < 0) ? Math.max(0, length + from) : from || 0; i < length; i++){
            if (this[i] === item) return i;
        }
        return -1;
    }
}

根据您使用的库,可能会有更好的方法来执行此操作

于 2013-10-16T18:23:40.650 回答
1

Mozilla 文档上有一个很好的polyfill。它应该是你需要的。很抱歉,您仍然需要处理 IE8。

// Production steps of ECMA-262, Edition 5, 15.4.4.14
// Reference: http://es5.github.io/#x15.4.4.14
if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function(searchElement, fromIndex) {

    var k;

    // 1. Let O be the result of calling ToObject passing
    //    the this value as the argument.
    if (this == null) {
      throw new TypeError('"this" is null or not defined');
    }

    var O = Object(this);

    // 2. Let lenValue be the result of calling the Get
    //    internal method of O with the argument "length".
    // 3. Let len be ToUint32(lenValue).
    var len = O.length >>> 0;

    // 4. If len is 0, return -1.
    if (len === 0) {
      return -1;
    }

    // 5. If argument fromIndex was passed let n be
    //    ToInteger(fromIndex); else let n be 0.
    var n = +fromIndex || 0;

    if (Math.abs(n) === Infinity) {
      n = 0;
    }

    // 6. If n >= len, return -1.
    if (n >= len) {
      return -1;
    }

    // 7. If n >= 0, then Let k be n.
    // 8. Else, n<0, Let k be len - abs(n).
    //    If k is less than 0, then let k be 0.
    k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);

    // 9. Repeat, while k < len
    while (k < len) {
      // a. Let Pk be ToString(k).
      //   This is implicit for LHS operands of the in operator
      // b. Let kPresent be the result of calling the
      //    HasProperty internal method of O with argument Pk.
      //   This step can be combined with c
      // c. If kPresent is true, then
      //    i.  Let elementK be the result of calling the Get
      //        internal method of O with the argument ToString(k).
      //   ii.  Let same be the result of applying the
      //        Strict Equality Comparison Algorithm to
      //        searchElement and elementK.
      //  iii.  If same is true, return k.
      if (k in O && O[k] === searchElement) {
        return k;
      }
      k++;
    }
    return -1;
  };
}
于 2015-06-17T22:51:28.513 回答