IE8浏览器不兼容indexOf、forEach、map解决方法

1、indexOf

//不兼容
if(codeArr.indexOf(code) == -1){
    //TODO 
}
//修改后
if($.inArray(code,codeArr) == -1){
  //TODO
}

2、forEach

IE8浏览器不兼容forEach，把所有forEach改成for

3、map

ie8浏览器不兼容map，需要引入以下代码

if (!Array.prototype.map) {
  Array.prototype.map = function(callback, thisArg) {
    var T, A, k;
    if (this == null) {
      throw new TypeError(" this is null or not defined");
    }
    var O = Object(this);
    var len = O.length >>> 0;
    if (typeof callback !== "function") {
      throw new TypeError(callback + " is not a function");
      if (thisArg) {
        T = thisArg;
      }
      A = new Array(len);
      k = 0;
      while(k < len) {
        var kValue, mappedValue;
        if (k in O) {
            kValue = O[ k ];
            mappedValue = callback.call(T, kValue, k, O);
            A[ k ] = mappedValue;
        }
        k++;
     }
     return A;
    };
  }
}