本文實例講述了JavaScript產生的動態下雨背景效果實作方法。分享給大家供大家參考。具體實作方法如下:
function initRain() {
a = 6;
r[i] = 1;
sn = Math.sin(a);
cs = Math.cos(a);
cx[i] = Math.random() * doc_width 1;
cy[i] = Math.random() * doc_height 1;
x[i] = r[i] * sn cx[i];
y[i] = cy[i];
}
function raindropIE() {
for (i = 0; i
updateRain();
if ((x[i] = (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
makeRain();
doc_width = document.body.clientWidth;
doc_height = document.body.clientHeight; }
document.all["dot" i].style.pixelTop = y[i];
document.all["dot" i].style.pixelLeft = x[i]; }
setTimeout("raindropIE()", speed);
}
function updateRain() {
r[i] = 10;
x[i] = r[i] * sn cx[i];
y[i] = r[i] * cs cy[i];
}
function makeRain() {
r[i] = 1;
cx[i] = Math.random() * doc_width 1;
cy[i] = 1;
x[i] = r[i] * sn cx[i];
y[i] = r[i] * cs cy[i];
}
raindropIE();
希望本文所述對大家的javascript程式設計有所幫助。