Javascript 新图像()应该是add.src吗?
关于新图像的问题() 我认为下面的代码来自“JavaScript示例第二版”Javascript 新图像()应该是add.src吗?,javascript,Javascript,关于新图像的问题() 我认为下面的代码来自“JavaScript示例第二版” planet[0] = "images/Venus.jpg" 这是错误的,应该是错误的 planet[0].src = "images/Venus.jpg" 替换 document.images["planet_pic"].src = planet[i]; 与 是这样吗 <!DOCTYPE html> <html> <head> <title>Slid
planet[0] = "images/Venus.jpg"
这是错误的,应该是错误的
planet[0].src = "images/Venus.jpg"
替换
document.images["planet_pic"].src = planet[i];
与
是这样吗
<!DOCTYPE html>
<html>
<head>
<title>Slide Show</title>
<script type="text/javascript">
var i = 0;
var timeout;
function preLoadImages() {
if (document.images) {
planet = new Array(); // global variable
planet[0] = new Image();
planet[0] = "images/Venus.jpg";
planet[1] = new Image();
planet[1] = "images/Neptune.jpg";
planet[2] = new Image();
planet[2] = "images/Earth.jpg";
planet[3] = new Image();
planet[3] = "images/Mars.jpg";
planet[4] = new Image();
planet[4] = "images/Jupiter.jpg";
}
else {
alert("There are no images to preload");
}
}
function startSlideShow() {
if (i < planet.length) {
document.images["planet_pic"].src = planet[i];
i++;
}
else {
i = 0;
document.images["planet_pic"].src = planet[i];
}
timeout = setTimeout('startSlideShow()', 1500);
}
function stopSlideShow() {
clearTimeout(timeout);
}
</script>
</head>
<body bgcolor="black" onload="preLoadImages()">
<img name="planet_pic" src="/images/Jupiter.jpg" height="348"
width="545px" />
<form>
<br />
<br />
<input type="button" value="Start Show"
onclick="return startSlideShow();" />
<input type="button" value="Stop Show"
onclick="return stopSlideShow();" />
</form>
</body>
</html>
幻灯片放映
var i=0;
var超时;
函数preload images(){
if(document.images){
planet=new Array();//全局变量
行星[0]=新图像();
行星[0]=“images/Venus.jpg”;
行星[1]=新图像();
行星[1]=“images/Neptune.jpg”;
行星[2]=新图像();
行星[2]=“images/Earth.jpg”;
行星[3]=新图像();
行星[3]=“images/Mars.jpg”;
行星[4]=新图像();
行星[4]=“images/Jupiter.jpg”;
}
否则{
警报(“没有要预加载的图像”);
}
}
函数startSlideShow(){
如果(i<行星长度){
document.images[“planet_pic”].src=planet[i];
i++;
}
否则{
i=0;
document.images[“planet_pic”].src=planet[i];
}
timeout=setTimeout('startSlideShow()',1500);
}
函数stopSlideShow(){
clearTimeout(超时);
}
是的,应该是
planet[0] = new Image();
planet[0].src = "images/Venus.jpg";
试试这个:
var list = ["Venus.jpg", "Neptune.jpg", "Earth.jpg", "Mars.jpg", "Jupiter.jpg"];
var img;
planet = []; // **WHY a global?** global variable
for (var i = 0; i < list.length; i++) {
img = new Image();
img.src = "images/" + list[i];
planet[i] = img;
// or planet.push(img);
}
var list=[“Venus.jpg”、“Neptune.jpg”、“Earth.jpg”、“Mars.jpg”、“Jupiter.jpg”];
var-img;
行星=[];//**为什么是全局变量?**全局变量
对于(变量i=0;i
var list = ["Venus.jpg", "Neptune.jpg", "Earth.jpg", "Mars.jpg", "Jupiter.jpg"];
var img;
planet = []; // **WHY a global?** global variable
for (var i = 0; i < list.length; i++) {
img = new Image();
img.src = "images/" + list[i];
planet[i] = img;
// or planet.push(img);
}