JS如何判断页面对象为空

function isEmptyObject(e) 
{
 var t; 
 for (t in e) 
 return !1; 
 return !0}

function isEmptyObject(e) 
{
 if(Object.keys(e).length === 0) 
 return true; 
 return false;}

function isEmptyObject(e) 
{
 if(Object.getOwnPropertyNames(object).length ===0)
 return true; 
 return false;}