javascript 新闻列表排序简单封装

function $(s){
return document.all?document.all[s]:document.getElementById(s);
}
function list_sort(list_id,btn1,btn2){
var list=$(list_id).getElementsByTagName("li");
var c_date=$(list_id).getElementsByTagName("span");
var content=$(list_id).getElementsByTagName("a");
var date=new Array(),con=new Array,date1=new Array(),con1=new Array,list_con=new Array;
for (var i=0;i<list.length ;i++ )//将要比较的内容存入数组
{date1[i]=date[i]=c_date[i].innerHTML;
list_con[i]=list[i].innerHTML;
con1[i]=con[i]=content[i].innerHTML.length;
}
con.sort(function(x,y){return parseInt(x)-parseInt(y);});//将字符长度排序
date.sort(function sortDate(a,b)
{
return new Date(a.replace(/-/,"/")) - new Date(b.replace(/-/,"/"));
});//将日期排序.
function darry(arry1,arry2){//取数组下标函数。
var b=new Array();
for (var n=0;n<list.length ;n++ )
{for (var m=0;m<list.length;m++ )
{if (arry1[m]==arry2[n]) b[n]=m;
}
}
return b;
}
var top=0;//定义排序方向浮标
$(btn1).onclick=function(){insetHTM(con1,con)}
$(btn2).onclick=function(){insetHTM(date1,date)}
function insetHTM(ary1,ary2){ //排序后的html输出到ul中
var c=darry(ary1,ary2);//取得排序后数组的下标
var list_html="";//定义变量存储排序后的html
if (top==0)
{for (var k=0;k<list.length;k++ )
{list_html+="<li>"+list_con[c[k]]+"</li>";top=1}
}
else
{ for (var k=list.length-1;k>=0;k--)
{list_html+="<li>"+list_con[c[k]]+"</li>";top=0}
}
$(list_id).innerHTML=list_html;
}
}
window.onload=function(){
list_sort("news_list","button1","button2")
}