<!DOCTYPE html><html><head><metacharset="utf-8"><title></title></head><body>
function sortNumber(a,b)
{
return b-a;
}
var arr = new Array(1,2,3,4);
var b=arr.join("");
document.write("原字符串:"+b+'<br>');
var b1=arr.sort(sortNumber).join('');
document.write("转换后字符串:"+b1);
</script></body></html>
反序输出字符串abcdefg
<!DOCTYPE html><html><head><meta charset="utf-8"><title></title></head><body><script type="text/javascript">
var arr="abcdefg";
document.write("原字符串:"+arr +'<br>');
document.write("转换后字符串:"+arr.split('').reverse().join(''));</script></body></html>