js实现图片漂浮效果的方法_javascript技巧

描述：打开网页就看到不停在飘动的图片，点击连接到其他页面；起到着重强调的效果！

代码如下:










var xPos = document.body.clientWidth - 20;
var yPos = document.body.clientHeight / 2;
var step = 1;
var delay = 10;
var height = 0;
var Hoffset = 0;
var Woffset = 0;
var yon = 0;
var xon = 0;
var pause = true;
var interval;
img.style.top = yPos;
function changePos() {
width = document.body.clientWidth;
height = document.body.clientHeight;
Hoffset = img.offsetHeight;
Woffset = img.offsetWidth;
img.style.left = xPos + document.body.scrollLeft;
img.style.top = yPos + document.body.scrollTop;
if (yon) {
yPos = yPos + step;
} else {
yPos = yPos - step;
}
if (yPos < 0) {
yon = 1;
yPos = 0;
}
if (yPos >= (height - Hoffset)) {
yon = 0;
yPos = (height - Hoffset);
}
if (xon) {
xPos = xPos + step;
} else {
xPos = xPos - step;
}
if (xPos < 0) {
xon = 1;
xPos = 0;
}
if (xPos >= (width - Woffset)) {
xon = 0;
xPos = (width - Woffset);
}
}
function start() {
img.visibility = "visible";
interval = setInterval('changePos()', delay);
}
function pause_resume() {
if (pause) {
clearInterval(interval);
pause = false;
} else {
interval = setInterval('changePos()', delay);
pause = true;
}
}
start();
// End -->

希望本文所述对大家的javascript程序设计有所帮助。