js 判断是否安装flash

function isFlashInstalled() {
    var hasFlash = false;
    try {
        var fo = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
        if (fo) {
            hasFlash = true;
        }
    } catch (e) {
        if (navigator.mimeTypes && navigator.mimeTypes['application/x-shockwave-flash'] !== undefined && navigator.mimeTypes['application/x-shockwave-flash'].enabledPlugin) {
            hasFlash = true;
        }
    }
    return hasFlash;
}

console.log(isFlashInstalled()); // 输出 true 或 false

<script src="https://cdnjs.cloudflare.com/ajax/libs/swfobject/2.2/swfobject.js"></script>
<script>
    function isFlashInstalled() {
        var hasFlash = false;
        try {
            var fo = new ActiveXObject('ShockwaveFlash.ShockwaveFlash');
            if (fo) {
                hasFlash = true;
            }
        } catch (e) {
            if (navigator.mimeTypes && navigator.mimeTypes['application/x-shockwave-flash'] !== undefined && navigator.mimeTypes['application/x-shockwave-flash'].enabledPlugin) {
                hasFlash = true;
            }
        }
        return hasFlash;
    }

    console.log(isFlashInstalled()); // 输出 true 或 false
</script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/modernizr/2.8.3/modernizr.min.js"></script>
<script>
    if (Modernizr.flash) {
        console.log('Flash is installed');
    } else {
        console.log('Flash is not installed');
    }
</script>