一甜攀、數(shù)組定義
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>數(shù)組定義</title>
<script type="text/javascript">
//var arr=[1,2,3,4];
var arr=new Array(1,2,3,4);
alert(arr[0]);
alert(arr.length);
alert(arr);
</script>
</head>
<body>
</body>
</html>
二秋泄、數(shù)組連接concat
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>字符串連接</title>
<script type="text/javascript">
/*
var str1='abc';
var str2='123';
alert(str1+str2);
*/
var arr1=[1,2,3];
var arr2=[6,7,8];
alert(arr1.concat(arr2));//輸出1,2,3,6,7,8
</script>
</head>
<body>
</body>
</html>
三、快速清空數(shù)組
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>數(shù)組定義</title>
<script type="text/javascript">
//var arr=[1,2,3,4];
var arr=new Array(1,2,3,4);
arr.length=0;
alert(arr);//沒有輸出
</script>
</head>
<body>
</body>
</html>
四规阀、將字符串變?yōu)閿?shù)組split
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>數(shù)組split</title>
<script type="text/javascript">
var str='12-4-5-8';
var arr=str.split('-');
alert(arr[0]);//彈出12
</script>
</head>
<body>
</body>
</html>
五恒序、將數(shù)組變?yōu)樽址甹oin
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>數(shù)組join</title>
<script type="text/javascript">
var arr=[1,2,3,4];
alert(arr.join('-'));//彈出1-2-3-4
</script>
</head>
<body>
</body>
</html>
六、splice
刪除： splice（開始谁撼，長度）
插入：splice(開始歧胁，0，元素）
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>數(shù)組splice</title>
<script type="text/javascript">
/* 1.從數(shù)組的中間刪除元素
var arr=[1,2,3,4,5,6,7,8];
arr.splice(2,3);
alert(arr);//輸出1,2,6,7,8
*/
/* 2.從中間插入元素
var arr=[1,2,3,4,5,6,7,8];
arr.splice(5,0,'a','b','c');
alert(arr);//輸出1,2,3,4,5,a,b,c,6,7,8
*/
//替換
var arr=[1,2,3,4,5,6,7,8];
arr.splice(1,2,'a','b');//輸出1,a,b,4,5,6,7,8
alert(arr);
</script>
</head>
<body>
</body>
</html>
七厉碟、排序sort
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>數(shù)組定義</title>
<script type="text/javascript">
//var arr=['float','zindex','xy','absolute','blue','leo'];
var arr=[96,8,12,72,33,118];
arr.sort(function(num1,num2){
return num2-num1;
});
alert(arr);//118,96,72,33,12,8
</script>
</head>
<body>
</body>
</html>
八喊巍、數(shù)組添加
push（元素）：從尾部添加
unshift（元素）:從頭部添加
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>數(shù)組定義</title>
<script type="text/javascript">
var arr=[1,2,3,4];
arr.push(4);
alert(arr);//彈出1,2,3,4,4
</script>
</head>
<body>
</body>
</html>
九、數(shù)組刪除
pop（）：從尾部彈出
shift（）:從頭部彈出
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>數(shù)組定義</title>
<script type="text/javascript">
var arr=[1,2,3,4];
arr.shift();
alert(arr);//彈出2,3,4
</script>
</head>
<body>
</body>
</html>
