js 判斷浏覽器是否安裝 flash 插件

//判斷方法
function flashChecker() {
    var hasFlash = 0;
    var flashVersion = 0;

    if(document.all) {
        var swf = new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
        if(swf) {
            hasFlash = 1;
            var 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};
}

//調用
var fls = flashChecker();
if(!fls.f) {
    if(confirm("你的浏覽器未安裝Flash插件，現在安裝？")) {
        window.location.href = "http://get.adobe.com/cn/flashplayer/";
    }
}