Java版本和安装检查没有'；行不通

我在网页中使用javascript检查计算机上是否安装了java和JavaWebStart

      var javawsInstalled = 0;
      var javaws150Installed = 0;
      isIE = "false";

      if (navigator.mimeTypes && navigator.mimeTypes.length) {
         x = navigator.mimeTypes['application/x-java-jnlp-file'];
         if (x){
            javawsInstalled = 1;
            javaws150Installed = 1;
         } 
      } else {
         isIE = "true";
      }
      console.log("javawsInstalled: " + javawsInstalled)
      console.log("javaws150Installed: "+ javaws150Installed)
      console.log("is IE" + isIE)

在此之前是代码

<SCRIPT language=VBScript>
          on error resume next
          If isIE = "true" Then
            If Not(IsObject(CreateObject("JavaWebStart.IsInstalled"))) Then
                  javawsInstalled = 0
            Else
                  javawsInstalled = 1
            End If

            If Not(IsObject(CreateObject("JavaWebStart.isInstalled.1.6.0.0"))) Then
                  javaws150Installed = 0
            Else
                  javaws150Installed = 1
            End If  
          End If
</SCRIPT> 

如果不是（

的可能重复项（IsObject（CreateObject（“JavaWebStart.IsInstalled”）），则

将

IsInstalled的第一个
i
更改为小写-例如，
如果不是（IsObject（CreateObject（“JavaWebStart.IsInstalled”）），则
）。。
javawsInstalled: 0 index_cn.jsp:27
javaws150Installed: 0 index_cn.jsp:28
is IEfalse