浏览器切换tab 或者隐藏 计时器出现的bug

var bowhidden="hidden" in document?"hidden": "webkithidden" in document?"webkithidden": "mozhidden" in document ?"mozhidden": null;
    var vibchage="visibilitychange" || "webkitvisibilitychange" || "mozvisibilitychange";
    document.addEventListener(vibchage,function (){
        /*ie10+  moz  webkit  默认*/
        if(!document[bowhidden]) /*false*/
        {
            ds= setInterval(function(){
    tomove();   
},3000);

        }
        else{
            /*true*/
            clearInterval(ds); 
        }
    });
var ds= setInterval(function(){
    tomove();   
},3000);