javascript 检查flash插件是否安装或启用

$(document).ready(function () {

var fls = flashChecker();
if (!fls.f || fls.f == 0) {
$("#fldUpFilePath").attr("disabled","disabled");
layer.Invoke.Top.Alert("检查到浏览器未安装flash插件或未启用falsh插件，请先安装或启用，否则上传功能无法使用");
}

});

//检查flash插件是否安装或启用
function flashChecker() {
var hasFlash = 0;　　　　 //是否安装了flash
var flashVersion = 0;　　 //flash版本

try {
if (document.all) {
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]);
}
}
}
}
}
catch (e) { }
return { f: hasFlash, v: flashVersion };
}