JS method to achieve centered paging effect on the current page

This article mainly introduces the method of JS to achieve the center paging effect of the current page, involving related techniques of javascript operating page elements and styles. Friends in need can refer to

function show_page(cur_pc)
{
  var cp=cur_pc;  //curent page count
  var tp=this.p;  //total page count
  var sp=this.pc;  //show page count
  var bp;      //begin page count
  var ep;      //end page count
  if(sp%2==0) sp=sp+1;   //this process need an odd number
  var dp=Math.floor(sp/2); //each side count to show
  var dif=tp-sp;  //check weather it have enough page to make mid-show
  var f=cp-dp;   //to check weather it has enough page to make mid-show from the begin
  var g=tp-(cp+dp); //to check weather it has enough page to make mid-show from the end
  if(sp && dif>=0)
  {
    if(g>0)
    {
      if(f>0)
      { 
        bp=f; 
        ep=cp+dp; 
      }
      else
      { 
        bp=1; 
        ep=2*dp+1; 
      }
    }
    else
    { 
      bp=tp-2*dp; 
      ep=tp; 
    }  
  }
  else
  { 
    bp=1; 
    ep=tp; 
  }
  var buf=[];
  for(var i=bp;i<=ep;i++)
  {
    if(i==cur_pc)
    {
      buf.push("<a href=&#39;javascript:;&#39; class=&#39;current&#39;>",i,"</a>");
    }
    else
    {
      buf.push("<a href=&#39;javascript:;&#39; class=&#39;normal&#39;>",i,"</a>");
    }
  }
  document.write(buf);
}

The running effect is as shown below:

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