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JavaScript基本入门语法集合

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创建脚本块
<script language=”JavaScript”>
JavaScript code goes here
</script>
隐藏脚本代码

<script language=”JavaScript”>
<!--
document.write(“Hello”);
// -->
</script>

浏览器不支持的时候显示

<noscript>
Hello to the non-JavaScript browser.
</noscript>

链接外部脚本文件

<script language=”JavaScript” src="/”youname.js"”></script>

注释脚本

// This is a comment
document.write(“Hello”); // This is a comment
/*
All of this
is a comment
*/

输出到浏览器

document.write(“<strong>输出内容</strong>”);

定义变量

var myVariable = “some value”;

字符串相加

var myString = “String1” + “String2”;

字符串搜索

<script language=”JavaScript”>
<!--
var myVariable = “Hello there”;
var therePlace = myVariable.search(“there”);
document.write(therePlace);
// -->
</script>

字符串替换

thisVar.replace(“Monday”,”Friday”);

格式化字串

<script language=”JavaScript”>
<!--
var myVariable = “Hello there”;
document.write(myVariable.big() + “<br>”);
document.write(myVariable.blink() + “<br>”);
document.write(myVariable.bold() + “<br>”);
document.write(myVariable.fixed() + “<br>”);
document.write(myVariable.fontcolor(“red”) + “<br>”);
document.write(myVariable.fontsize(“18pt”) + “<br>”);
document.write(myVariable.italics() + “<br>”);
document.write(myVariable.small() + “<br>”);
document.write(myVariable.strike() + “<br>”);
document.write(myVariable.sub() + “<br>”);
document.write(myVariable.sup() + “<br>”);
document.write(myVariable.toLowerCase() + “<br>”);
document.write(myVariable.toUpperCase() + “<br>”);
var firstString = “My String”;
var finalString = firstString.bold().toLowerCase().fontcolor(“red”);
// -->
</script>

创建数组

<script language=”JavaScript”>
<!--
var myArray = new Array(5);
myArray[0] = “First Entry”;
myArray[1] = “Second Entry”;
myArray[2] = “Third Entry”;
myArray[3] = “Fourth Entry”;
myArray[4] = “Fifth Entry”;
var anotherArray = new Array(“First Entry”,”Second Entry”,”Third Entry”,”Fourth Entry”,”Fifth Entry”);
// -->
</script>

数组排序

<script language=”JavaScript”>
<!--
var myArray = new Array(5);
myArray[0] = “z”;
myArray[1] = “c”;
myArray[2] = “d”;
myArray[3] = “a”;
myArray[4] = “q”;
document.write(myArray.sort());
// -->
</script>

分割字符串

<script language=”JavaScript”>
<!--
var myVariable = “a,b,c,d”;
var stringArray = myVariable.split(“,”);
document.write(stringArray[0]);
document.write(stringArray[1]);
document.write(stringArray[2]);
document.write(stringArray[3]);
// -->
</script>

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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