function ScrollText(content,btnPrevious,btnNext,autoStart) { this.Delay = 10; this.LineHeight = 20; this.Amount = 1;//注意:LineHeight一定要能整除Amount. this.Direction = "up"; this.Timeout = 5000; this.ScrollContent = this.$(content); this.ScrollContent.innerHTML += this.ScrollContent.innerHTML; if(btnNext) { this.NextButton = this.$(btnNext); this.NextButton.onclick = this.GetFunction(this,"Next"); this.NextButton.onmouseover = this.GetFunction(this,"Stop"); this.NextButton.onmouseout = this.GetFunction(this,"Start"); } if(btnPrevious) { this.PreviousButton = this.$(btnPrevious); this.PreviousButton.onclick = this.GetFunction(this,"Previous"); this.PreviousButton.onmouseover = this.GetFunction(this,"Stop"); this.PreviousButton.onmouseout = this.GetFunction(this,"Start"); } this.ScrollContent.onmouseover = this.GetFunction(this,"Stop"); this.ScrollContent.onmouseout = this.GetFunction(this,"Start"); if(autoStart) { this.Start(); } } ScrollText.prototype.$ = function(element) { return document.getElementById(element); } ScrollText.prototype.Previous = function() { clearTimeout(this.AutoScrollTimer); clearTimeout(this.ScrollTimer); this.Scroll("up"); } ScrollText.prototype.Next = function() { clearTimeout(this.AutoScrollTimer); clearTimeout(this.ScrollTimer); this.Scroll("down"); } ScrollText.prototype.Start = function() { clearTimeout(this.AutoScrollTimer); this.AutoScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Timeout); } ScrollText.prototype.Stop = function() { clearTimeout(this.ScrollTimer); clearTimeout(this.AutoScrollTimer); } ScrollText.prototype.AutoScroll = function() { if(this.Direction == "up") { if(parseInt(this.ScrollContent.scrollTop) >= parseInt(this.ScrollContent.scrollHeight) / 2) { this.ScrollContent.scrollTop = 0; } this.ScrollContent.scrollTop += this.Amount; } else { if(parseInt(this.ScrollContent.scrollTop) <= 0) { this.ScrollContent.scrollTop = parseInt(this.ScrollContent.scrollHeight) / 2; } this.ScrollContent.scrollTop -= this.Amount; } if(parseInt(this.ScrollContent.scrollTop) % this.LineHeight != 0) { this.ScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Delay); } else { this.AutoScrollTimer = setTimeout(this.GetFunction(this,"AutoScroll"), this.Timeout); } } ScrollText.prototype.Scroll = function(direction) { if(direction=="up") { if(this.ScrollContent.scrollTop == 0) { this.ScrollContent.scrollTop = parseInt(this.ScrollContent.scrollHeight) / 2; } this.ScrollContent.scrollTop -= this.Amount; } else { this.ScrollContent.scrollTop += this.Amount; } if(parseInt(this.ScrollContent.scrollTop) >= parseInt(this.ScrollContent.scrollHeight) / 2) { this.ScrollContent.scrollTop = 0; } if(parseInt(this.ScrollContent.scrollTop) % this.LineHeight != 0) { this.ScrollTimer = setTimeout(this.GetFunction(this,"Scroll",direction), this.Delay); } } ScrollText.prototype.GetFunction = fu
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