如何从javascript中的switch语句调用函数

Question

新手上路，请多包涵

我是 javascript 的新手，所以我可能看不清楚我的问题。我正在尝试创建一个搜索栏，它只搜索 3 个不同的项目。我已经构建了我要调用的函数，但我无法让它在 switch 语句函数中显示该函数。

 function doSearch() { //start doSearch
searchvalue = document.searchbox.searchterm.value

switch (searchvalue){ //start switch statement
    case "4426": buildProduct(); //this is the part that I can't get to work properly.
                 break
    case "88123": buildProduct();
                  break
    case "2400X": buildProduct();

    default:  alert("Sorry, please try again.")
              break
 } //end switch statement

} //end doSearch

搜索框显示正常，它甚至会提醒 default 很好，但是当我输入 4426 并单击时，它什么也不做。我能够让它工作的唯一方法是添加 document.writeln (buildProduct); 而不是 buildProduct() 。表单的 HTML 是

<FORM NAME="searchbox">
    <INPUT TYPE="TEXT" NAME="searchterm">
    <INPUT TYPE="BUTTON" VALUE="Search" ONCLICK="Javascript:doSearch()">
</FORM>

编辑：这是完整的代码。

 function makeHeader() {
     var data = "<B>"
     data +="<H1>Computers for Sale:</H1>"
     data +="</B>"
     return(data)
}
function makeFooter() {
     var data = "<B>"
     data +="<small>Copyright 2013 ComputersforSale</small>"
     data +="</B>"
     return(data)
}
function buildProduct(prodName, prodID, prodDescription) { //start buildProduct
var data ="<TABLE style='width:100%' BORDER=1 CELLPADDING=10><tr><td>"
data += makeHeader()
data += "</td></tr>"
data += "<tr><td>"
data += prodName + '</br>' + prodID + '<br>' + prodDescription
data += "</td></tr>"
data += "<tr><td>"
data += makeFooter()
data += "</td></tr>"
data += "</table>"
return(data)
document.writeln(buildProduct)
document.close()

} //end buildProduct

function doSearch() { //start doSearch
searchvalue = document.searchbox.searchterm.value
switch (searchvalue){ //start switch statement
case "4426":
  buildProduct();
  break;

case "88123":
  buildProduct();
  break;

case "2400X":
  buildProduct();
  break;

default:
  alert("Sorry, please try again.")
  break;
} //end switch statement

} //end doSearch

该函数的 HTML 链接：

 <a href= "Javascript:buildProduct('HP 4426', '4426','Newest and Best Laptop from HP Computer')">Item #1 HP 4426</a></br>
<a href= "Javascript:buildProduct('IBM 88123 ThinkPad', '88123','IBM micro Laptop Computer')">Item #2 IBM 88123 ThinkPad</a></br>
<a href= "Javascript:buildProduct('Dell Dimension 2400', '2400X','A fast 2.4 ghz computer, 80 GB HD, 256 Meg, CDRW and DVD.')">Item #3 Dell Dimension 2400</a>