javascript 鼠标移入隐藏层显示，移出图层隐藏

    
    
    
        window.onload = function(){
           var div = document.getElementsByClassName("one");
            for(var i =0;i                div[i].onmouseover = function(e){
                        var xuan = this.getElementsByClassName("xuan")[0];
                        xuan.style.display = "block";
                };
                div[i].onmouseout = function(e){
                        var xuan = this.getElementsByClassName("xuan")[0];
                        xuan.style.display = "none";
                };
            }
            document.getElementsByClassName("di")[0].querySelector("input[type=checkbox]").onclick = function(){
                var checkbox = document.querySelectorAll("input[name=checkbox]");

                    if(this.checked ==true){
                        for(var i =0;i                            checkbox[i].checked =true;
                        }
                    }else{
                        for(var i =0;i                            checkbox[i].checked = false;
                        }
                }

            }
        };