在函数调用javascript之间保留变量值

我有一些变量，我想在函数调用之间保留它们的值，有人能分享如何在javascript中做到这一点吗。我尝试过使用全局变量，但这没有帮助。非常感谢您的帮助，例如在下面的代码中，在函数内部跳转，无论何时调用它，提醒的值总是相同的，并不是每次函数调用都会增加。警报(this.prevVal(；和警报(this.currentVal(；

// We're using a global variable to store the number of occurrences
var MyApp_SearchResultCount = 0;
var currSelected = 0;
var countStr = 0; 


//var prevEl,el;
// helper function, recursively searches in elements and their child nodes
function MyApp_HighlightAllOccurencesOfStringForElement(element,keyword) {
  if (element) {
    if (element.nodeType == 3) {        // Text node
      while (true) {
        var value = element.nodeValue;  // Search for keyword in text node
        var idx = value.toLowerCase().indexOf(keyword);
        if (idx < 0) break;             // not found, abort
        var span = document.createElement("span");
        var text = document.createTextNode(value.substr(idx,keyword.length));
        span.appendChild(text);
        span.setAttribute("class","MyAppHighlight");
        span.style.backgroundColor="yellow";
        span.style.color="black";
        text = document.createTextNode(value.substr(idx+keyword.length));
        element.deleteData(idx, value.length - idx);
        var next = element.nextSibling;
        element.parentNode.insertBefore(span, next);
        element.parentNode.insertBefore(text, next);
        element = text;
        window.MyApp_SearchResultCount++;   // update the counter
        //countStr = MyApp_SearchResultCount;   
      }
    } else if (element.nodeType == 1) { // Element node
      if (element.style.display != "none" && element.nodeName.toLowerCase() != 'select') {
        for (var i=element.childNodes.length-1; i>=0; i--) {
          MyApp_HighlightAllOccurencesOfStringForElement(element.childNodes[i],keyword);
        }
      }
    }
  }
}
// the main entry point to start the search
function MyApp_HighlightAllOccurencesOfString(keyword) {
    alert("test");
  //MyApp_RemoveAllHighlights();
  MyApp_HighlightAllOccurencesOfStringForElement(document.body, keyword.toLowerCase());
    alert(window.MyApp_SearchResultCount);  
}
// helper function, recursively removes the highlights in elements and their childs
function MyApp_RemoveAllHighlightsForElement(element) {
  if (element) {
    if (element.nodeType == 1) {
      if (element.getAttribute("class") == "MyAppHighlight") {
        var text = element.removeChild(element.firstChild);
        element.parentNode.insertBefore(text,element);
        element.parentNode.removeChild(element);
        return true;
      } else {
        var normalize = false;
        for (var i=element.childNodes.length-1; i>=0; i--) {
          if (MyApp_RemoveAllHighlightsForElement(element.childNodes[i])) {
            normalize = true;
          }
        }
        if (normalize) {
          element.normalize();
        }
      }
    }
  }
  return false;
}
// the main entry point to remove the highlights
function MyApp_RemoveAllHighlights() {
  window.MyApp_SearchResultCount = 0;
  MyApp_RemoveAllHighlightsForElement(document.body);
}

function goNext(){
    jump(1);
}
function goPrev(){
    jump(-1);
}
var prevSelected = 0;
var currSelectedGlo = 0; 
this.prevVal = 0; 
this.currentVal = 0;
function jump(howHigh){
    this.prevVal = this.currentVal; 
    this.currentVal = this.currentVal + 1; 
    alert(this.prevVal);
    alert(this.currentVal);

    prevSelected = currSelected;
    currSelected = currSelected + howHigh;
    //window.currSelectedGlo = currSelected + howHigh; 
    //currSelected = window.currSelectedGlo;
    //alert("prevSelected" +prevSelected);
    //alert("window.currSelected "+ currSelected);
    //alert(window.MyApp_SearchResultCount);
    //alert(currSelected);
    if (currSelected < 0){  
        currSelected = window.MyApp_SearchResultCount + currSelected;
    }
    if (currSelected >= window.MyApp_SearchResultCount){
        currSelected = currSelected - window.MyApp_SearchResultCount;
    }
    prevEl = document.getElementsByClassName("MyAppHighlight")[prevSelected];
    //alert(window.prevEl);
    if (prevEl){
        prevEl.style.backgroundColor="yellow";
    }
    el = document.getElementsByClassName("MyAppHighlight")[currSelected]; 
    el.style.backgroundColor="green";
    el.scrollIntoView(true); //thanks techfoobar

}

谢谢djrecker