JavaScript显示分页按钮

/**
 *
 * @param total_page    总页数
 * @param current_page  当前页
 * @param num           页面显示多少个分页按钮
 * @returns {string}
 */
exports.get_page_html = function(total_page,current_page,num){
    //范围判断
    if(current_page>total_page) {
        current_page = total_page;
    }
    //当前页的前后各显示多少页
    var count = Math.floor(num/2);

    var page_html = "";
    if(total_page<=1) {
        //只有一页
        page_html += ‘<li><a class="paginator-button" href="?page=1">1</a></li>‘;
    }else if(total_page<=num) {
        //把页数全部显示出来
        for(var i=1;i<=total_page;i++) {
            page_html += ‘<li><a class="paginator-button" href="?page=‘+i+‘>‘+i+‘</a></li>‘;
        }
    }else {
        if(current_page-count>1) {
            //显示前一页按钮
            page_html += ‘<li><a class="paginator-button" href="?page=‘+(current_page-count-1)+‘"><i class="fa fa-chevron-left"></i></a></li>‘;
        }
        //显示当前页前面的页码按钮
        for(var i=count;i>=1;i--) {
            if(current_page-i>0){
                page_html += ‘<li><a class="paginator-button" href="?page=‘+(current_page-i)+‘">‘+(current_page-i)+‘</a></li>‘;
            }
        }

        //当前页按钮
        page_html += ‘<li><a class="paginator-button" href="?page=‘+current_page+‘">‘+current_page+‘</a></li>‘;

        //显示当前页后面的页码按钮
        for(var j=1;j<=count;j++){
            if((current_page+j)<=total_page){
                page_html += ‘<li><a class="paginator-button" href="?page=‘+(current_page+j)+‘">‘+(current_page+j)+‘</a></li>‘;
            }
        }

        if(current_page+count<total_page){
            //显示后一页按钮
            page_html += ‘<li><a class="paginator-button" href="?page=‘+(current_page+count+1)+‘"><i class="fa fa-chevron-right"></i></a></li>‘;
        }
    }
    return page_html;
}