- document not docunment ;
- var xx=document.getElementById("demo1); //别看不起一对引号" " .
-
三目运算符的格式 -------表达式1?表达式2:表达式3; //注意 : 是英文状态下的
JavaScript小案例----点击灯泡发光
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>灯泡闪亮</title>
</head>
<body>
<img id="demo1" onClick="light()" src="js/pic_bulboff.gif" />
<p>点击灯泡可放光</p>
<script>
function light(){
var xx=document.getElementById("demo1");
if(xx.src.match("bon")){
xx.src="js/pic_bulboff.gif" ;
}else{
xx.src="js/pic_bulbon.gif" ;
}
}
</script>
</body>
</html>
还可以这样写：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>灯泡闪亮</title>
</head>
<body>
<img id="demo1" onClick="light()" src="js/pic_bulboff.gif" />
<p>点击灯泡可放光</p>
<script>
function light(){
var xx=document.getElementById("demo1");
xx.src=xx.src.match("bon")?"js/pic_bulboff.gif":"js/pic_bulbon.gif";
}
</script>
</body>
</html>运行结果：
