css代碼如下：

             *{
                 margin:0;
                 padding:0;
              }
              body{
		background: url("./img/wallhaven1.png");
		  }
            .item{
            	width: 100px;
            	height: 30px;
                margin-bottom: 5px;
                margin-left: 5px;
                padding: 5px 10px;
            	background: #B89C9B;
            	text-align: center;
                line-height: 30px;
            	color:white;
            	border-radius: 10px;

            }      
           
           
            #line{
                color:red;
                width: 4px;
                height: 40px;
                background: red;
                position: absolute;
                top:0px;
                padding-right: 1px;
            }

js代碼如下：

效果圖：

默認(rèn)時(shí)，紅色橫線在1標(biāo)簽處，點(diǎn)擊2時(shí)，紅色標(biāo)簽，會(huì)根據(jù)移動(dòng)函數(shù)進(jìn)行移動(dòng)，如圖（2）

二.在此基礎(chǔ)上，根據(jù)css3來實(shí)現(xiàn)橫線的過度平滑效果。

html代碼如下：

	   
		    課程學(xué)習(xí)
		    課程筆記
		    課程練習(xí)
		    課程相關(guān)
		    課程拓展
	    
	    
   
 
   
  
  	    
  

css代碼如下：

        .item1{  
                width: 100px;
            	height: 30px;
                margin-bottom: 5px;
                margin-left: 5px;
                padding: 5px 10px;          	
            	background: #1E293B;             
            	float:left;
            	text-decoration:none; 
                color:white;
                 line-height: 30px;
            	border-radius: 10px;

            }             
            
             #line1{
                color:red;
                width: 120px;
                height: 2px;
                background: red;
                position: absolute;
                top:175px;
                left:5px;
                padding-top: 1px;
               
            }
            #nav2{
            	 list-style-type: none; 
            }
            #nav2 a{
            	display: block;
                text-decoration:none; 
                color:white;
            }
            #nav2 a:hover{
            	background-color: #1E291a;
            	color:red;
            }
            #pic{
            	margin-top:80px; 
            	margin-left: 10px;
            

            }
            img{
            	width: 200px;
            	height:200px;
            	border-radius: 15px;
            }
            .effect0{
            	transform: translateX(1px);
            	transition:all  2s;
            }
            .effect{             	
            	transform: translateX(125px);
            	transition:all  2s;
            }
             .effect2{             	
            	transform: translateX(250px);
            	transition:all  2s;
            }
             .effect3{             	
            	transform: translateX(375px);
            	transition:all  2s;
            }
             .effect4{             	
            	transform: translateX(500px);            	
            	transition:all  2s;
            }
           .piceffect{
                transform: translateX(600px) scale(1.5);
                transition: all 2s;
           }

js代碼如下：

var nav2 = document.getElementById('nav2'); 
var pic = document.getElementById('pic');
nav2.addEventListener("click",move,false);
function move(event){
    	 	 var event=event||window.event;
	       	 var target=event.target||event.srcElement;;
	       	 switch(target.id){
	       	 	case "id11":           
                     line1.className = "effect0";
	       	         pic.className = "effect0";
	       	         break;
	       	    case "id21":       
	       	         line1.className = "effect";
	       	         pic.className = "effect";
	       	          break;
	       	    case "id31":
	       	         line1.className = "effect2";
	       	         pic.className = "effect2";
	       	         break;
	       	    case "id41":       	    
		       	      line1.className = "effect3";
		       	      pic.className = "effect3";
		       	      break;
	       	    case "id51":	       	      
	       	        line1.className = "effect4";
	       	        pic.className = "effect4";
	       	        break;	       	 	   
	       	 }
	       	    }    
	  pic.addEventListener("click",showbig,false);
	  function showbig(){	  	
	  	pic.className="piceffect";
	  }

效果圖：

當(dāng)鼠標(biāo)沒有點(diǎn)擊標(biāo)簽時(shí)，橫線默認(rèn)是在第一個(gè)標(biāo)簽下，如圖：

當(dāng)點(diǎn)擊任何一個(gè)標(biāo)簽，下劃線和圖片就會(huì)平滑的過度到點(diǎn)擊的那個(gè)標(biāo)簽下，如圖：

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