JavaScript小应用之分页算法

效果图：

function getPagination(curPage, pagesize, count) {
    var total = Math.ceil(count/pagesize);
    if (curPage > total) curPage = total;

    var pl = curPage; // pager left  
    var cur_item = "<b>" + pl + "</b>";  
    var nl = 0; // number left  
    while(--pl > 0){  
        cur_item = "<a>" + pl +"</a>" + cur_item;  
        nl++;  
        if(nl >= 2 && pl > 3){ 
            cur_item = "<a>1</a>" + "<i>...</i>" + cur_item;  
            break;  
        }  
    }  

    var pr = curPage; // pager right  
    var nr = 0; // number right
    var mcb = 5; // max continuously button
    while(++pr <= total){  
        cur_item = cur_item + "<a>" + pr +"</a>";  
        nr++;  
        if( (1 + nl + nr) >= mcb && pr < (total -1 )){  
            cur_item = cur_item + "<i>...</i>" + "<a>" + total + "</a>";  
            break;  
        }  
    }  
      
    return cur_item;  
}

console.log(getPagination(1, 10, 8));

console.log(getPagination(1, 10, 18));

console.log(getPagination(4, 10, 188));

console.log(getPagination(8, 10, 188));

console.log(getPagination(17, 10, 188));

测试：

var curPage = 1, pagesize = 8, count = 38;
// <b>1</b><a>2</a><a>3</a><a>4</a><a>5</a>

var curPage = 2, pagesize = 8, count = 38;
// <a>1</a><b>2</b><a>3</a><a>4</a><a>5</a>

var curPage = 5, pagesize = 8, count = 38;
// <a>1</a><a>2</a><a>3</a><a>4</a><b>5</b>



var curPage = 5, pagesize = 8, count = 200;
// <a>1</a><a>2</a><a>3</a><a>4</a><b>5</b><a>6</a><i>...</i><a>25</a>

var curPage = 10, pagesize = 8, count = 200;
// <a>1</a><i>...</i><a>8</a><a>9</a><b>10</b><a>11</a><a>12</a><i>...</i><a>25</a>

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