js动态文字滚动的例子_javascript技巧



代码如下:





var POSITION = 50;
var DELAY = 150;
var MESSAGE = "这是一个动态JavaScript文字显示的例子";
function bannerObject(){
this.msg = MESSAGE;
this.out = " ";
this.pos = POSITION;
this.delay = DELAY;
this.i = 0;
this.reset = clearMessage;
}
　
function clearMessage(){
this.pos = POSITION;
}
var scroll = new bannerObject();
function scroller(){
scroll.out += " ";
if(scroll.pos>0)
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);
document.noticeForm.notice.value = scroll.out;
scroll.out = " ";
scroll.pos--;
scroll.pos--;
if (scroll.pos < -(scroll.msg.length)) {
scroll.reset();
}
window.setTimeout("scroller()", scroll.delay);
}









在状态栏滚动文字
代码如下:





var msg = "这是一个跑马灯效果的JavaScript文档";
var interval = 100;
var spacelen = 120;
var space10 = " ";
var seq = 0;
function Scroll() {
len = msg.length;
window.status = msg.substring(0, seq + 1);
seq++;
if (seq >= len) {
seq = spacelen;
window.setTimeout("Scroll2();", interval);
}
else
window.setTimeout("Scroll();", interval);
}
function Scroll2() {
var out = "";
for (i = 1; i <= spacelen / space10.length; i++)
out +=space10;
out = out + msg;
len = out.length;
window.status = out.substring(seq, len);
seq++;
if (seq >= len) { seq = 0; };
window.setTimeout("Scroll2();", interval);
}
Scroll();