怎么判断控件是否安装了呢
<OBJECT
classid = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
codebase = "http://210.222.48.75/jvm_setup.exe"
WIDTH = "1024" HEIGHT = "768" >
<PARAM NAME = CODE VALUE = "testauto.Applet1.class" >
<PARAM NAME = CODEBASE VALUE = "." >
<PARAM NAME = "type" VALUE = "application/x-java-applet;version=1.4">
<PARAM NAME = "scriptable" VALUE = "false">
<PARAM NAME = "projectId" VALUE="<%=theForm.getProjectId().toString()%>" >
<PARAM NAME = "userId" VALUE="<%=userId%>" >
<PARAM NAME = "logLevel" VALUE="INFO" >
<COMMENT>
<EMBED
type="application/x-java-applet;jpi-version=1.4.1"
CODE="testauto.Applet1.class"
CODEBASE="."
WIDTH="1024"
HEIGHT="768"
projectId="<%=theForm.getProjectId().toString()%>"
userId="<%=userId%>"
logLevel="INFO"
scriptable=false
pluginspage="http://java.sun.com/j2se/1.4.1/download.html">
<NOEMBED>
Could not find a plugin supported by your browser. Please download Sun's Java Plugin 1.4.1
</noembed>
</EMBED>
</COMMENT>
</OBJECT>
这个是判断是否安装了jvm的,是吧?
由于这个JVM比较大,所以下载的时间就比较长,所以我想在他下载的时候给个提示,叫他等待,如果安装了JVM的就不会下载了的,这个提示呢也不会显示
所以怎么判断这个提示什么时候显示,什么时候不显示啊,代码怎么写啊,我是不懂网页的,我只是做applet,如果别人机器上没有JVM,就给他下载安装