弹出警告信息
<script language=”JavaScript”>
<!--
window.alert(“Hello”);
// -->
</script>
弹出确认框
<script language=”JavaScript”>
<!--
var result = window.confirm(“Click OK to continue”);
// -->
</script>
定义函数
<script language=”JavaScript”>
<!--
function multiple(number1,number2) {
var result = number1 * number2;
return result;
}
// -->
</script>
调用JS函数
<a href=”#” onClick=”functionName()”>Link text</a>
<a href="/”javascript:functionName"()”>Link text</a>
在页面加载完成后执行函数
<body onLoad=”functionName();”>
Body of the page
</body>
条件判断
<script>
<!--
var userChoice = window.confirm(“Choose OK or Cancel”);
var result = (userChoice == true) ? “OK” : “Cancel”;
document.write(result);
// -->
</script>
指定次数循环
<script>
<!--
var myArray = new Array(3);
myArray[0] = “Item 0”;
myArray[1] = “Item 1”;
myArray[2] = “Item 2”;
for (i = 0; i < myArray.length; i++) {
document.write(myArray + “<br>”);
}
// -->
</script>
设定将来执行
<script>
<!--
function hello() {
window.alert(“Hello”);
}
window.setTimeout(“hello()”,5000);
// -->
</script>
定时执行函数
<script>
<!--
function hello() {
window.alert(“Hello”);
window.setTimeout(“hello()”,5000);
}
window.setTimeout(“hello()”,5000);
// -->
</script>
取消定时执行
<script>
<!--
function hello() {
window.alert(“Hello”);
}
var myTimeout = window.setTimeout(“hello()”,5000);
window.clearTimeout(myTimeout);
// -->
</script>
在页面卸载时候执行函数
<body onUnload=”functionName();”>
Body of the page
</body>
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