栏底提示技巧

栏底提示技巧

<html><title>网页特效三则</title>
<SCRIPT language=JavaScript>
var MESSAGE = "欢迎光临四平之窗 "
var POSITION = 100
var DELAY  = 5
var scroll = new statusMessageObject()
function statusMessageObject(p,d) {
this.msg = MESSAGE
this.out = " "
this.pos = POSITION
this.delay = DELAY
this.i   = 0
this.reset = clearMessage}
function clearMessage() {
this.pos = POSITION}
function scroller() {
for (scroll.i = 0; scroll.i < scroll.pos; scroll.i++) {
  scroll.out += " "}
if (scroll.pos >= 0)
scroll.out += scroll.msg
else scroll.out = scroll.msg.substring(-scroll.pos,scroll.msg.length)
window.status = scroll.out
scroll.out = " "
scroll.pos--
if (scroll.pos < -(scroll.msg.length)) {
scroll.reset()}
setTimeout ('scroller()',scroll.delay)}
function snapIn(jumpSpaces,position) {
var msg = scroll.msg
var out = ""
for (var i=0; i<position; i++)
  {out += msg.charAt(i)}
for (i=1;i<jumpSpaces;i++)
  {out += " "}
out += msg.charAt(position)
window.status = out
if (jumpSpaces <= 1) {
  position++
  if (msg.charAt(position) == ' ')
   {position++ }
  jumpSpaces = 100-position
} else if (jumpSpaces > 3)
    {jumpSpaces *= .75}
else
  {jumpSpaces--}
if (position != msg.length) {
  var cmd = "snapIn(" + jumpSpaces + "," + position + ")";
  scrollID = window.setTimeout(cmd,scroll.delay);
} else {  window.status=""
  jumpSpaces=0
  position=0
  cmd = "snapIn(" + jumpSpaces + "," + position + ")";
  scrollID = window.setTimeout(cmd,scroll.delay);
  return false }
return true}
snapIn(100,0);
</SCRIPT>
</html>