function a(obj1){
     
        var x=obj1.innerHTML;
        var y=document.getElementsByTagName("div");
       
        switch(x){
        case "房产":
        y[1].setAttribute("display","none");
        //y[2].display="none";y[0].display="block";
    
        break;
        case "家居":
        y[0].display="none";y[2].display="none";y[1].display="block";
        alert("2");
        break;
        case "二手房":
        y[1].display="none";y[0].display="none";y[2].display="block";
        alert("3");
        break;
        default:alert("4");break;
       
        }
       
    }