原生js实现动态页脚

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原生js实现，现在呢已经被bootstrap封装成一个组件啦，可以看看怎么实现的，提高自己的编程能力。

一、写之前你必须知道的知识

  1. 如何获取dom节点
  2. 怎么删除一个节点
  3. 怎么设置节点属性
  4. 清晰的逻辑

二、直接上代码啦~

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<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>动态页脚</title>
		<style>
			.hide{
    display: none!important;
}
.pagination{
    margin: 0 auto;
    padding: 0;
    list-style: none;
    text-align: center;
}
.pagination li{
    display: inline-block;
    width: 30px;
    height: 30px;
    overflow: hidden;
    line-height: 30px;
    margin: 0 5px 0 0;
    font-size: 14px;
    text-align: center;
    border: 1px solid #00bc9b;
    color: #00bc9b;
    cursor: pointer;
}
.pagination li.current,
.pagination li:hover{
    background: #00bc9b;
    color: #ffffff;
}
.demo {
    margin: 10px 0;
    padding: 10px;
    background: #eeeeee;
    text-align: center;
}
		</style>
	</head>
	<body>
	<ul class="pagination" id="jsPagination">
    <li>首页</li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li>末页</li>
</ul>
<div class="demo">
    <div>(Demo1) total: 10，current: 4</div>
    <ul class="pagination">
        <li>首页</li>
        <li>2</li>
        <li>3</li>
        <li class="current">4</li>
        <li>5</li>
        <li>6</li>
        <li>末页</li>
    </ul>
</div>
<div class="demo">
    <div>(Demo2) total: 0，current: 0</div>
    <ul class="pagination hide">
        <li>首页</li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
        <li>末页</li>
    </ul>
</div>
<div class="demo">
    <div>(Demo3) total: 3，current: 2</div>
    <ul class="pagination">
        <li class="hide">首页</li>
        <li>1</li>
        <li class="current">2</li>
        <li>3</li>
        <li class="hide"></li>
        <li class="hide"></li>
        <li class="hide">末页</li>
    </ul>
</div>
<div class="demo">
    <div>(Demo4) total: 10，current: 2</div>
    <ul class="pagination">
        <li class="hide">首页</li>
        <li>1</li>
        <li class="current">2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>末页</li>
    </ul>
</div>
<div class="demo">
    <div>(Demo5) total: 10，current: 9</div>
    <ul class="pagination">
        <li>首页</li>
        <li>6</li>
        <li>7</li>
        <li>8</li>
        <li class="current">9</li>
        <li>10</li>
        <li class="hide">末页</li>
    </ul>
</div>
		<script>
			//var total = 0;
			function pagination(total, current) {
			    var cur = document.getElementById("jsPagination");
			    var cNodes = cur.getElementsByTagName("li");
			    if(total==0){
			    	cur.style.display = "none";
			    }
			    if(total<5){
			    	cNodes[0].style.display="none";
			    	cNodes[6].style.display="none";
			    	var j = 1;
			    	for(var i=1;i<=total;i++){
			    		cNodes[j++].innerHTML = i;
			    	}
			    	for(var m=1;m<=(5-total);m++){
			    		cNodes[total].parentNode.removeChild(cNodes[total+1]);
			    	}
			    	cNodes[current].setAttribute("class","current");
			    }
			    if(total>5){
			    	if(current<=2){
			    		cNodes[0].style.display = "none";
			    		for(var i=1;i<=5;i++){
			    			cNodes[i].innerHTML=i;
			    			if(i==current){
			    			cNodes[i].setAttribute("class","current");
			    		    }
			    		}
			    	}else if((total-current)<=2){
			    		cNodes[6].style.display="none";
			    		var tem = total-4;
			    		for(var i=1;i<=5;i++){
			    			cNodes[i].innerHTML = tem;
			    			if(tem==current){
			    			cNodes[i].setAttribute("class","current");
			    		    }
			    			tem++;
			    		}
			    	}else{
			    		var j = 1;
				    	for(var i=current-2;i<=current+2;i++){
				    		cNodes[j++].innerHTML = i;
				    		if(i==current){
				    			cNodes[j-1].setAttribute("class","current");
				    		}
				    	}
			    	}
			    	
			    }
			    
			}
			pagination(10,9); 
		</script>
	</body>
</html>