高手就能够直接跳过了，刚開始学习javascript,从零開始， 记录一点一滴，不断提高。
菜鸟的不断成长。
以下就写上几个简单的JS 入门代码吧。高手就不要BS了
<!DOCTYPE html>
<html>
<body>
<script>
function changeImage(){
element=document.getElementById("myimage")
if(element.src.match("bulbon")){
element.src="i/eg_bulboff.gif";
}else{
element.src="i/eg_bulbon.gif";
}
}
</script>
<img id="myimage" onclick="changeImage()" src="i/eg_bulboff.gif" />
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>Jscript样例1</h1>
<p id="demo">
hello world.welcome to here.
</p>
<script type="text/javascript">
function myf(){
x=document.getElementById("demo");
x.innerHTML="你好，PPKER。欢迎来到JS";
}
</script>
<input type="button" onclick="myf()" value="点击">
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>改变样式</h1>
<p id="demo">
德玛上单，不给就送啊！
</p>
<script type="text/javascript">
function myf(){
x=document.getElementById("demo");
x.style.color="red";
}
</script>
<input type="button" onclick="myf()" value="点击">
</body>
</html><!DOCTYPE html>
<html>
<head><meta charset="utf-8" /></head>
<body>
<input id="demo" type="text">
<script type="text/javascript">
function myf()
{
var x=document.getElementById("demo").value;
if(x==""||isNaN(x))
{
alert("姐，请输入数字");
}else{
alert("OK");
}
}
</script>
<button type="button" onclick="myf()">点击这里</button>
</body>
</html><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
function myf(){
document.getElementById("demo").innerHTML="~~~上MISS了，嘿嘿嘿";
}
</script>
</head>
<body>
<p id="demo">努克萨斯</p>
<button type="button" onclick="myf()">点击</button>
</body>
</html>
高手就不要BS了，都是从菜鸟開始的。别总是在想怎样学好，坚持下去吧。无他，唯孰而已。