js检测是否安装了flash插件

function flashChecker() {
var hasFlash = 0; //是否安装了flash
var flashVersion = 0; //flash版本
var isIE = /*@cc_on!@*/0; //是否IE浏览器
if (isIE) {
var swf = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
if (swf) {
hasFlash = 1;
VSwf = swf.GetVariable("$version");
flashVersion = parseInt(VSwf.split(" ")[1].split(",")[0]);
}
} else {
if (navigator.plugins && navigator.plugins.length > 0) {
var swf = navigator.plugins["Shockwave Flash"];
if (swf) {
hasFlash = 1;
var words = swf.description.split(" ");
for (var i = 0; i < words.length; ++i) {
if (isNaN(parseInt(words[i]))) continue;
flashVersion = parseInt(words[i]);
}
}
}
}
return {f: hasFlash, v: flashVersion};
}

var fls = flashChecker();
var s = "";
if (fls.f) document.write("您安装了flash,当前flash版本为: " + fls.v + ".x");
else document.write("您没有安装flash");

来源：http://www.cnblogs.com/yyman001/p/3429456.html