js(javascript)判断移动端代码

js(javascript)判断移动端代码如下：
function checkMobile(){  
    var isiPad = navigator.userAgent.match(/iPad/i) != null;  
    if(isiPad){  
        return false;  
    }  
    var isMobile=navigator.userAgent.match(/iphone|android|phone|mobile|wap|netfront|x11|java|opera mobi|opera mini|ucweb|windows ce|symbian|symbianos|series|webos|sony|blackberry|dopod|nokia|samsung|palmsource|xda|pieplus|meizu|midp|cldc|motorola|foma|docomo|up.browser|up.link|blazer|helio|hosin|huawei|novarra|coolpad|webos|techfaith|palmsource|alcatel|amoi|ktouch|nexian|ericsson|philips|sagem|wellcom|bunjalloo|maui|smartphone|iemobile|spice|bird|zte-|longcos|pantech|gionee|portalmmm|jig browser|hiptop|benq|haier|^lct|320x320|240x320|176x220/i)!= null;  
    if(isMobile){  
        return true;  
    }  
    return false;  
}