Internet Explorer 8-新的Map（）替代

Question

是否可以轻松地替换“ var exampleMap = new Map（）;” Internet Explorer 8支持的功能？在Chrome中通过测试编写应用程序后，我意识到它不受支持。

我能想到的最好的解决方案是使用[key，[values]]，但这似乎效率极低。

function processData(allText) {
  var numOfColumns = 5;
  var allTextLines = allText.split(/\r\n|\n/);

  return allTextLines;
}

function parseArray(data) {

  var allText = processData(data);

  var systemApplication = new Map();

  for (var i = 1; i < allText.length; i++) {

    currentApplicationParameters = allText[i].split(",");
    currentApplicationName = currentApplicationParameters[0];

    var rsamApplicationProperties = function (entitlementName, environmentName, resourceSequence) {
      this.entitlementName = entitlementName;
      this.environmentName = environmentName;
      this.resourceSequence = resourceSequence;
    };

    if (systemApplication.has(currentApplicationName)) {
      var arrayOfAppParams = [];
      arrayOfAppParams = [systemApplication.get(currentApplicationName)];
      arrayOfAppParams[0].push(new rsamApplicationProperties(
        currentApplicationParameters[1], currentApplicationParameters[3], currentApplicationParameters[2]));
        var myNewArray = [].concat.apply([], arrayOfAppParams);
        systemApplication.set(currentApplicationName, myNewArray);

    } else {

      arrayOfAppParams = [new rsamApplicationProperties(currentApplicationParameters[1], currentApplicationParameters[3], currentApplicationParameters[2])];
      systemApplication.set(currentApplicationName, arrayOfAppParams);
    }
  }