html+css+javascript实现跟随鼠标移动显示选中效果的方法

3，主要的css样式

.line-lpu{ height:55px; position:relative; width:100%; overflow:hidden;}
    .line-lpu span{ width:43px; height:46px; background:url('https://www.efose.com/images/banners/lpu_03.png') no-repeat; position:absolute;top:0;}
    .border-lpu{border-bottom:1px  solid #959595; height:23px; }
     .join-lpu li{ width:19%; float:left; margin-right:8px;background:none; padding:0; }
    .join-lpu li a{ display:block; color:#606060; text-decoration:none; border:1px solid #959595; min-height:215px; padding:10px;position:relative; overflow:hidden;} 
    .join-lpu li a:hover{border:1px solid #337ab7;}
    .join-lpu li b{ font-size:60px; position:absolute; bottom:7px; right:-1px; font-style:italic; color:#c7c7c7;}
    .clear{clear:both;}
    .step-lpu span{ background:url('https://www.efose.com/images/banners/icon-lpu.png') no-repeat; display:block; width:75px; height:65px; margin-left:28px;}
    .step-lpu .icon0{ background-position:0 0;}
    .step-lpu .icon1{ background-position:0 -70px;}
    .step-lpu .icon2{ background-position:0 -140px;}
    .step-lpu .icon3{ background-position:0 -204px; height:58px; margin-bottom:7px;}
    .step-lpu .icon4{ background-position:0 -260px;}

4，JavaScript的编写

        //实例化animationHover对象
        window.onload = function(){
            var ah = new animationHover();  
            ah.init();
        }; 
        //初始化标签对象
        function animationHover(){
            this.step = document.getElementById('step');
            this.stepLi = this.step.getElementsByTagName('li');
            this.line = document.getElementById('line');
            this.attr = null;
            this.timer = null;
            this.target = null;
                            
            }
        //初始化事件
        animationHover.prototype.init=function(){
            This =this;
            for(var i=0;i0?Math.ceil(speed):Math.floor(speed); 
                            //防止取整引起的抖动
                if(target==attrValue) clearInterval(timer); 
                            //如果到达目标点，关闭定时器
                else{
                    obj.style.left=attrValue+speed+'px';
                }
                },100);
                                    
            };
        //获取当前标签对象的css属性值
        animationHover.prototype.getStyle =function(obj,attr){                    
            if(obj.currentStyle){                
                return obj.currentStyle[attr];
            }else{
                return getComputedStyle(obj,false)[attr];
            }
            };    

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