感谢张龙的视频
js17.html
<script type="text/javascript">
//采用confirm
if(confirm("你确定继续?")){
window.location.href="http://www.google.com";
}
else {
alert("bye");
}
</script>
js19.html
<body>
<!-- 按钮的单击事件绑定到clickHandler函数-->
<input type= "button" value="click me"id = "button1">
<script type="text/javascript">
var v = document.getElementById("button1");
v.onclick = clickHandler;
function clickHandler(){
alert("hai");
}
</script>
</body>
js20.html和js21.html实现来回页面的切换
js20.html
<body>
<a href="js21.html">click me </a>
</body>
js21.html
<body>
<a href="#" onclick="window.history.back()"return false>return</a>
</body>
js22.html
<script type="text/javascript">
//五秒后自动转向别的页面
var timerId;
function onLoad(){
timerId = setInterval('setNum()', 1000);
}
</script>
</head>
<body onload="onLoad();">
<script type="text/javascript">
var sec = 5;
function setNum(){
if(sec > 0){
document.getElementById("num").innerHTML = sec--;
}
else {
clearInterval(timerId);
location.href = "http://www.google.com";
}
}
</script>
五秒钟后前往<br>
<font id = "num" size="7">5</font>
</body>
</html>