移动Firefox点击拦截

var appcontent = document.getElementById(\"appcontent\"); // Firefox
if (!appcontent) {
    appcontent = event.currentTarget; // Fennec
}

appcontent.addEventListener(\"click\", function(event) {      

    if(event.target.tagName.toLowerCase() == \"a\"){
        alert(\"click detected\" + );
    }
 }, true);