js判断浏览器是否安装Flash

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 function detectFlash() {
                if (navigator.mimeTypes.length > 0) {
                    return navigator.mimeTypes["application/x-shockwave-flash"].enabledPlugin != null;
                } else if (window.ActiveXObject) {
                    try {
                        new ActiveXObject("ShockwaveFlash.ShockwaveFlash");
                        return true;
                    } catch (oError) {
                        return false;
                    }
                } else {
                    //no way to detect!
                    return false;
                }
            }
            
            if (detectFlash()){
                alert("You have Flash installed.");
            } else {
                alert("You do not have Flash installed.");
            }

js判断浏览器是否安装Flash

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原文地址：http://www.cnblogs.com/sccblog/p/4575450.html