死循环打开多个窗口，执行就会死机啊
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var x = 0
var speed = 120
var text = "欢迎光临网页教学网!"
var course = 120
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if (course < text2.length) {
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setTimeout("Scroll()", speed);
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function Scroll2() {
window.status = text2.substring(x, text2.length)
if (text2.length - x == text.length) {
text2 = text
x = 0
setTimeout("Scroll()", speed);
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else {
x++
setTimeout("Scroll2()", speed);
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}
Scroll()
//-->
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