花瓣变叉叉是因为下面语句中的图片地址失效或者你的电脑没有连接上网络
STAR[0] = "http://blog.com.cn/skin/lixia/236605054.gif"
.....
<SCRIPT language=JavaScript1.2>
<!-- Begin
//<!-- Original: Altan (snow@altan.hr) -->
//<!-- Web Site: http://www.altan.hr/snow -->
// Script arranged by Hisa (http://www.suisen.sakura.ne.jp/~ikitai/js/)
var no = 13// STAR number?@?P¡ë?¨C¨º?¨¦?o?¨¦¡ë?¡®??¨¬¨C??¡±
var speed = 10// smaller number moves the STAR faster
STAR = new Array()
STAR[0] = "http://blog.com.cn/skin/lixia/236605054.gif"
STAR[1] = "http://blog.com.cn/skin/lixia/236596767.gif"
STAR[2] = "http://blog.com.cn/skin/lixia/236597338.gif"
STAR[3] = "http://blog.com.cn/skin/lixia/236598420.gif"
STAR[4] = "http://blog.com.cn/skin/lixia/236599138.gif"
STAR[5] = "http://blog.com.cn/skin/lixia/236600240.gif"
var ns4up = (document.layers) ? 1 : 0 // browser sniffer
var ie4up = (document.all) ? 1 : 0
var dx, xp, yp // coordinate and position variables
var am, stx, sty // amplitude and step variables
var i, doc_width = 1500, doc_height = 1800
if (ns4up) {
doc_width = self.innerWidth
doc_height = self.innerHeight
} else if (ie4up) {
doc_width = document.body.clientWidth
doc_height = document.body.clientHeight
}
dx = new Array()
xp = new Array()
yp = new Array()
am = new Array()
stx = new Array()
sty = new Array()
j = 0
for (i = 0i <no++ i) {
dx[i] = 0 // set coordinate variables
xp[i] = Math.random()*(doc_width-50) // set position variables
yp[i] = Math.random()*doc_height
am[i] = Math.random()*20// set amplitude variables
stx[i] = 0.02 + Math.random()/10// set step variables
sty[i] = 0.7 + Math.random()// set step variables
if (ns4up) { // set layers
if (i == 0) {
document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src=\"" + STAR[j] + "\" border=\"0\"></layer>")
} else {
document.write("<layer name=\"dot"+ i +"\" left=\"15\" top=\"15\" visibility=\"show\"><img src=\"" + STAR[j] + "\" border=\"0\"></layer>")
}
} else if (ie4up) {
if (i == 0) {
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absoluteZ-INDEX: "+ i +" VISIBILITY: visibleTOP: 15pxLEFT: 15pxwidth:1\"><img src=\"" + STAR[j] + "\" border=\"0\"></div>")
} else {
document.write("<div id=\"dot"+ i +"\" style=\"POSITION: absoluteZ-INDEX: "+ i +" VISIBILITY: visibleTOP: 15pxLEFT: 15pxwidth:1\"><img src=\"" + STAR[j] + "\" border=\"0\"></div>")
}
}
if (j == (STAR.length-1)) { j = 0} else { j += 1}
}
function STAR_NS() { // Netscape main animation function
for (i = 0i <no++ i) { // iterate for every dot
yp[i] += sty[i]
if (yp[i] >doc_height-50) {
xp[i] = Math.random()*(doc_width-am[i]-30)
yp[i] = 0
stx[i] = 0.02 + Math.random()/10
sty[i] = 0.7 + Math.random()
doc_width = self.innerWidth
doc_height = self.innerHeight
}
dx[i] += stx[i]
document.layers["dot"+i].top = yp[i]
document.layers["dot"+i].left = xp[i] + am[i]*Math.sin(dx[i])
}
setTimeout("STAR_NS()", speed)
}
function STAR_IE() { // IE main animation function
for (i = 0i <no++ i) { // iterate for every dot
yp[i] += sty[i]
if (yp[i] >doc_height-50) {
xp[i] = Math.random()*(doc_width-am[i]-30)
yp[i] = 0
stx[i] = 0.02 + Math.random()/10
sty[i] = 0.7 + Math.random()
doc_width = document.body.clientWidth
doc_height = document.body.clientHeight
}
dx[i] += stx[i]
document.all["dot"+i].style.pixelTop = yp[i]
document.all["dot"+i].style.pixelLeft = xp[i] + am[i]*Math.sin(dx[i])
}
setTimeout("STAR_IE()", speed)
}
if (ns4up) {
STAR_NS()
} else if (ie4up) {
STAR_IE()
}
// End -->
</SCRIPT>
jquery改变CSS背景图修改方法如果需要使用Jquery修改CSS网页背景样式。用户可以这样写$(‘p’).css({"background-image":"url(../images/msg_btn.gif"})
Jquery-CSS用法
css() 方法返回或设置匹配的元素的一个或多个样式属性。返回第一个匹配元素的 CSS 属性值。注释：当用于返回一个值时，不支持简写的 CSS 属性（比如 "background" 和 "border"）。
参考资料：JQuery
