我需要知道客户端机器上安装的java版本，在这里想出了解决方案
How to write JavaScript function to check JRE version
当我尝试时，得到了答案：
console.log(deployJava.getJREs());
但是在地址栏，弹出菜单是这样显示的
如何隐藏？
如果这不能实现，请提出任何其他的想法来实现，因为这个不能使用，如果这个弹出没有被抑制
【问题讨论】：
标签： java javascript deployjava
从最近的实验中我很确定没有办法抑制它。对于检测插件版本的脚本，它必须调用插件本身。
在这些实验之后，我创建了一个脚本，该脚本可以在不调用插件本身的情况下检测出关于 Java 插件的各种事情。他们依靠检查 mime 类型信息。
这仍然会在 IE 中显示警告如果从本地文件系统打开。但我希望如果从 Internet 加载它会更宽容。请回来报告。
但请注意，当“允许脚本”检查正常时，它为 IE 报告的内容。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Java Information - Non Deployment Toolkit Script</title>
<meta name='author' content='Andrew Thompson'>
<meta name='description' content='Non Deployment Toolkit Script'>
<script src='mimetypes.js'></script>
<style type='text/css'>
.true {
background-color: #6F6;
}
.false {
background-color: #FB0;
}
.undefined {
background-color: #FF0;
}
.datum {
font-family: monospace;
}
td {
padding: 4px;
}
</style>
</head>
<body>
<h1>Java on this PC</h1>
<h2>Overview</h2>
<p>This page endeavors to ascertain the installation, availability
& version of the Java installed on the client PC.
More importantly, it attempts to discover the information <b>without
invoking the Java Plug-In</b> itself.
The last part is what makes it different
to the Deployment Toolkit Script supplied by Oracle.
</p>
<script type='text/javascript'>
document.write("<h2>Browser Info.</h2>");
document.write(getBrowserInfo());
document.write("<h2>Basic Info.</h2>");
document.write("<table border='1'>");
document.write(get3CellRow('<b>Enabled</b>', isJava(), 'Java is enabled (1.1+) - IE info. (short of ActiveX) stops here'));
document.write(get3CellRow('<b>Version</b>', getVersion(), 'Maximum version reliably <em>known</em> to be available'));
if (isIE()) {
document.write(get3CellRow('<b>MSIE</b>', getIEVersion(), 'Maximum version reliably known to be available in IE, tested using ActiveX'));
}
document.write(get3CellRow('<b>JWS</b>', isJWS(), 'Java Web Start available (1.4.2+)'));
document.write(get3CellRow('<b>Plug-In 2</b>', isPlugin2(), 'Plug-In 2 available (1.6.0_10+)'));
document.write("</table>");
if (plugins.length>0) {
document.write("<h2>Navigator Plug-Ins</h2>");
document.write("<table border='1'>");
document.write("<tr><th>Name</th><th>Version</th><th>File Name</th><th>Description</th></tr>");
for (var ii=0; ii<plugins.length; ii++) {
var t = plugins[ii].name;
if (t.indexOf("Java")>-1) {
document.write("<tr>");
document.write("<td>" + plugins[ii].name + "</td>");
document.write(getDataStyledCell(plugins[ii].version));
document.write("<td>" + plugins[ii].filename + "</td>");
document.write("<td>" + plugins[ii].description + "</td>");
document.write("</tr>");
}
}
document.write("</table>");
}
if (mimes.length>0) {
document.write("<h2>Navigator Mime-Types</h2>");
document.write("<table border='1'>");
document.write("<tr><th>Mime</th><th>Description</th><th>Types</th></tr>");
for (var ii=0; ii<mimes.length; ii++) {
var t = mimes[ii].type;
if (t.indexOf("java")>0 &&
((t.indexOf("jpi")>0 || t.indexOf("deploy")>0 || t.indexOf("jnlp")>0 || t.indexOf("vm")>0) ||
mimes[ii].description.length>0)
) {
document.write("<tr>");
document.write("<td>" + mimes[ii].type + "</td>");
document.write("<td>" + mimes[ii].description + "</td>");
document.write("<td>" + mimes[ii].suffixes + "</td>");
document.write("</tr>");
}
}
document.write("</table>");
}
</script>
<hr>
<h2>Description</h2>
<p>In order (if available) the information is:
<ul>
<li><b>Browser info. Table:</b> Not strictly related to Java - the
information in the other tables is determined without
further reference to any information shown in this table (except for the <code>appName</code> used for
identifying IE).
OTOH it is an helpful guide
as to what we should be <em>expecting</em>
from the other information. E.G. IE
will not show the Plug-In or Mime Type tables. <em>Only</em>
FF displays the plug-in version numbers.
</li>
<li><b>Basic info. Table</b>
<ul>
<li><b>Enabled</b>: Java is known to this browser and enabled, according to JavaScript <code>navigator.javaEnabled()</code>.</li>
<li><b>Version</b>: The maximum Java version known to be supported in this browser/PC.
It is set to <code>1.1</code> if the previous check is <code>true</code>, since the MSVM
was the first Java version the public could get in a browser, and the MSVM
implemented Java 1.1. Goes on to check
<code>application/x-java-applet;jpi-version</code>
in the mime types if available
(i.e. typically browsers that are <em>not</em> IE).
</li>
<li><b>MSIE</b> (IE Only): The maximum Java version known to be supported by this instance of Internet Explorer
as determined using ActiveX. It runs from 1.4.2, 1.5.0.. through 1.9.0.
</li>
<li><b>JWS</b>:
Inferred from a comparison of the version to the Sun JRE in which
it was co-bundled.</li>
<li><b>Plug-In 2</b>:
Inferred from a comparison of the version to the Sun JRE in which
it was introduced.</li>
</ul>
</li>
<li><b>Navigator Object Tables:</b>
<em>The rest of the info. is gleaned from the <code>navigator</code> object.
IE does not include this information.</em>
<ul>
<li><b>Plug-Ins</b>: More details of the Java related plugins.
Filtered for <code>Java</code> in the <code>name</code>.
A <code>description</code> showing "Next Generation Java Plug-in" or <code>name</code>
"Java Deployment Toolkit" should be 1.6.0_10+.</li>
<li><b>Mime-Types</b>: More information on the Java related Mime-Types.
Filtered in <code>mime</code> field for <code>'java'</code> + <code>('jpi'||'vm'||'deploy')</code>
or a non-empty <code>description</code>.
The value <code>java-deployment-toolkit</code> in the <code>mime</code>
is a good indicator of 1.6.0_10+.
</li>
</ul>
</li>
</ul>
</body>
</html>
// As a version string, this might be '1.4.2_31'.
// I.E. it is not a 'number' but a 'string' and therefore must be treated as a string.
var highestVersion = 'undefined';
var mimes = window.navigator.mimeTypes;
var plugins = window.navigator.plugins;
function isJava() {
return (
typeof(navigator.javaEnabled) !== 'undefined' &&
navigator.javaEnabled());
}
function getVersion() {
var version = 0;
if (isJava()) {
version = 1.1;
}
for (var ii=0; ii<mimes.length; ii++) {
var t = mimes[ii].type;
if (t.indexOf("java")>0 &&
t.indexOf("jpi")>0 &&
t.indexOf("applet")>0
) {
var parts = t.split("=");
version = parts[parts.length-1];
}
}
if (highestVersion=='undefined') highestVersion = version;
return version;
}
function isJWS() {
var ver = highestVersion;
var className = false;
if (ver>'1.0') {
className = undefined;
}
if (ver>'1.4.2') {
className = true;
}
return className;
}
function isPlugin2() {
var ver = highestVersion;
var className = false;
if (ver>'1.0') {
className = undefined;
}
if (ver>'1.6.0_10') {
className = true;
}
return className;
}
var versionFamily = [
'1.9.0', '1.8.0', '1.7.0',
'1.6.0', '1.5.0', '1.4.2'
];
function getIEVersion() {
for (var i=0; i<versionFamily.length; i++) {
if (testUsingActiveX(versionFamily[i])) {
return versionFamily[i];
}
}
return false;
}
if (isIE() && getVersion()=='1.1') {
highestVersion = getIEVersion();
}
function isIE() {
return navigator.appName=='Microsoft Internet Explorer';
}
function testUsingActiveX(version) {
var objectName = 'JavaWebStart.isInstalled.' + version + '.0';
// we need the typeof check here for this to run on FF/Chrome
// the check needs to be in place here - cannot even pass ActiveXObject
// as arg to another function
if (typeof ActiveXObject == 'undefined' || !ActiveXObject) {
alert('[testUsingActiveX()] Browser claims to be IE, but no ActiveXObject object?');
return false;
}
try {
return (new ActiveXObject(objectName) != null);
} catch (exception) {
return false;
}
}
function get3CellRow(cell1, cell2, cell3) {
var s = "" +
"<tr>" +
"<td class='" +
getClassName(cell1) +
"'>" +
cell1 +
"</td>" +
getDataStyledCell(cell2) +
"<td class='" +
getClassName(cell3) +
"'>" +
cell3 +
"</td>" +
"</tr>" +
"";
return s;
}
function getDataStyledCell(value) {
var s = "<td class='datum " +
getClassName(value) +
"'>" +
value +
"</td>";
return s;
}
function getClassName(val) {
var className = undefined;
if (
(val) ||
(!val) ||
(val!=="undefined")
) {
className = val;
}
return className;
}
function getBrowserInfo() {
var s = "";
var props = [
'appCodeName','appName','appVersion',
'userAgent',
'platform','cookieEnabled'
];
s += "<table border='1'>";
for (var i=0; i<props.length; i++) {
s+= "<tr>";
s+= "<td><b>";
s+= props[i];
s+= "</b></td>";
s+= "<td>";
s+= navigator[props[i]];
s+= "</td>";
s+= "</tr>";
}
s += "</table>";
return s;
}
请注意（被警告）这个脚本是由我编写的，我是一名 Java 程序员。 Java 程序员通常是编写 JS 的地球上最糟糕的人，因为我们愚蠢地倾向于假设。 “它是 JavaScript，它有多难？”。
写出真正好的 JavaScript 确实是一门艺术。
更糟糕的是，这是为了以后改进而被“破解”的实验性代码，但该项目被放弃了，“后来”从未到来。
告诫购买者。
【讨论】：