JavaScript生成的动态下雨背景效果实现方法

  作者:bea

本文实例讲述了JavaScript生成的动态下雨背景效果实现方法。分享给大家供大家参考。具体实现方法如下: 代码如下: <HTML> <HEAD> <TITLE>JavaScript生成的动态下雨背景效果</TITLE> </HEAD> <BODY bgcolor="#fef4d2" > <center> <script language=JavaScript>
本文实例讲述了JavaScript生成的动态下雨背景效果实现方法。分享给大家供大家参考。具体实现方法如下:


代码如下:


<HTML>
<HEAD>
<TITLE>JavaScript生成的动态下雨背景效果</TITLE>
</HEAD>
<BODY bgcolor="#fef4d2" >
<center>
<script language=JavaScript>
<!-- [Step1]: 在此能够设置雨滴的多少 -->
var rainsize = 40;
<!-- [Step2]: 这里可以更改下雨的速度,数值大速度慢 -->
var speed = 10;
var x = new Array();
var y = new Array();
var r = new Array();
var cx = new Array();
var cy = new Array();
var doc_width = document.body.clientWidth;
var doc_height = document.body.clientHeight;

for(i=0; i<rainsize; ++i) {   initRain();   if (i == 0) {     document.write("<div id="dot"+ i +"" style="POSITION: ");     document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");     document.write("visible; TOP: 15px; LEFT: 15px;"><font color="blue">");     document.write(",</font></div>"); }   else {     document.write("<div id="dot"+ i +"" style="POSITION: ");     document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");     document.write("visible; TOP: 15px; LEFT: 15px;"><font color="blue">");     document.write(",.</font></div>");  } }
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 < rainsize; ++ i) {      updateRain();      if ((x[i] <= 1) || (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(); </script> </BODY> </HTML>


希望本文所述对大家的javascript程序设计有所帮助。


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