Example of paging plug-in implemented in pure JavaScript_javascript skills

The example in this article describes the paging plug-in implemented in pure JavaScript. Share it with everyone for your reference. The details are as follows:

//总条数(必填)
var Num=Number(<&#63;php echo $count;&#63;>)
//当前页(必填)
var index = Number(<&#63;php echo $page;&#63;>);
/* //每页的条数(可选,默认每页10条) */
var pageNum=Number(10); 
/* //最大显示的页码的数目(可选，默认显示5个页码,页码数目必须大于等于1) */
var maxPageNum=Number(5);
//以下可忽略
//计算得出总页数
var count = (Num%pageNum)>0&#63;(Num/pageNum+1):(Num/pageNum);
count=Math.floor(count);//取整转化为数据类型
//显示的最小页码,
var first=1;
//显示的最大页码，首先last<=count;其次last是小于等于count的最大数//last=index+maxPageNum/2;
var last =1;
var decrease=Math.floor(maxPageNum/2);//当前页向上增加值
var increase=Math.floor(maxPageNum/2);//当前页向下减少值
if(maxPageNum>=1){
 if(maxPageNum==1){//最多显示一页时
  first=index<=count&#63;index:count; 
  last=index<=count&#63;index:count;  
 }else{
   //first要大于零
   first=(index-decrease);
   while(first<=0){
    first++;
   } 
   //first判断显示的最后一页
   if((count-index)<=decrease){
    var diff=count-first;
    while(diff<maxPageNum-1){
     if(first==1){
      break;
     }else{
      --first;
      diff=count-first;
     }
    }
   }
   //last要小于count
   last=(index+increase);
   while(last>=1){
    if(last<=count){
     break;
    }
    last--;
   } 
   //last//判断显示的最后一页与maxPageNum的关系
   last=last>=maxPageNum&#63;last:(maxPageNum>count&#63;count:maxPageNum);
 }
}else{
 alert("至少需要显示一个页码!");
}
var prev = index - 1;//上一页
var next = index+ 1;//下一页 
var str = "<tr>";
if(count==0){
 str += "<td>共<a href='#'>0</a>页</td><td>";
}else if(index>count||index<=0){
 str="<td style='color:blue;' >页码超出范围</td>";
}else if (count > 0) {
 str += "<td>";
 if(first>1){
  str += "  <span style='color:#4169E1;' >...</span>  ";
 }
 var i=1;
 for(i=first;i<=last; i++){
  if(i==index){
   str += "  <a href='#' style='color:#4169E1;' onclick='submit(" + i + ");'>[" + i+ "]</a>  ";
  }else{
   str += "  <a href='#' onclick='submit(" + i + ");'>" + i+ "</a>  ";
  }
 } 
  if(last<count){
   str += "  <span style='font-size:16px;color:#4169E1;' >...</span>  "; 
  }
  str+="</td><td style='font-size: 14px;'>共<a href='#first' style='color:#4169E1;font-size: 16px;' >"+ Num +"</a>条</td>";
  /* if(index!=1){
   str +="<td style='width:60px;font-family: 微软雅黑;font-size: 14px;' ><a href='#' id='prev' onclick='submit(" + prev+ ");'>上一页</a></td>"; 
  }
  if(index<count){
   str +="<td style='width:60px;font-family: 微软雅黑;font-size: 14px;'><a href='#' id='next' onclick='submit("+ next + ");'>下一页</a></td>";
  }*/
  if(index!=1&&count>1){
   str += "<td style='width:40px;font-family: 微软雅黑;font-size: 14px;white-space: nowrap;'>  <a href='#' id='first' name='first' onclick='submit(1);'>首页</a>  </td>";
  }
  if(index!=count&&count>1&&index<count){
   str += "<td style='width:40px;font-family: 微软雅黑;font-size: 14px;white-space: nowrap;'>  <a href='#' onclick='submit(" + count+ ");'>尾页</a>  </td>" ;
  } 
   str+="</tr>";
}
//分页区域填写
$('.page').html(str);
<table class="page">
<tr><td>此处分页只需要传递给我当前页码和总页数即可</td></tr>
</table>
//根据页码查询,
function submit(pageIndex) {
 //var sortInfo = $.getUrlParam('sortInfo');//判断是哪一个页面的查询
 var url = "<&#63;php echo current_url();&#63;>&#63;page="+pageIndex+"&field=<&#63;php echo$field;&#63;>&value=<&#63;php echo $field_value;&#63;>";
 window.location.href=url;
}

I hope this article will be helpful to everyone’s JavaScript programming design.