JavaScript?? ?? ??? ??? ???
?? ??: ?? ??? ?? ?????.
length ??: ??? ??? ???? ?????. ?: var len = arrObj.length
join()
??: ??? ???? ?????. ???? ?????.
??: arrObj.join(?? ??)
??: ??? "?? ??" ???? ???? ??? ??? ??? ?????.
reverse()
??: ?? ??? ??? ??? ????.
??: arrObj.reverse()
????: ??
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>php.cn</title>
<script>
//將以下字符串轉(zhuǎn)成數(shù)組， 然后再轉(zhuǎn)成字符串
var str = "北京,上海,深圳,南京,合肥";
//轉(zhuǎn)成數(shù)組
var arr=str.split(",");
//再轉(zhuǎn)換成字符串
str = arr.join(",") ;
document.write("類型是："+typeof(str)+",字符串為："+str);
</script>
</head>
<body>
</body>
</html>
?? ?? ?? ? ??
?? ?? ??? ?? ?? ??? ?? ??? ? ??? ??? ??? ??? ?? ??? ?? ??? ???? ????(arr.length).
?? ?? ??? ???? ??? ? ?? ???? ??? ? ????.
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>php.cn</title> <script> var arr=[1,2,3,4,5,6,7,8]; arr.reverse(); document.write(arr); </script> </head> <body> </body> </html>
shift(): ??? ? ?? ??? ????, ??? ?? ????, ??? 1?? ????.
pop(): ??? ??? ??? ????, ??? ?? ????, ??? 1?? ????.
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>php.cn</title>
<script>
//使用delete刪除元素，查看長度是否改變
var arr=[1,2,3,4,5,6,7,8];
document.write("數(shù)組的長度為"+arr.length+",值為"+arr+"<br/>");
delete arr[0];
delete arr[1];
delete arr[2];
document.write("數(shù)組的長度為"+arr.length+",值為"+arr+"<br/>");
</script>
</head>
<body>
</body>
</html>unshift(): ?? ??? ?? ??? ?? ?? ???? ??? ???? ???. arrObj.unshift(“a”, “b”, “c”)
push(): ?? ?? ?? ??? ?? ??? ?????. , ??? ?????. arrObj.push(“a”, “b”, “c”)
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>php.cn</title>
<script>
//使用delete刪除元素，查看長度是否改變
var arr=[1,2,3,4,5,6,7,8];
document.write("數(shù)組的長度為"+arr.length+",值為"+arr+"<br/>");
arr.shift();
document.write("數(shù)組的長度為"+arr.length+",值為"+arr+"<br/>");
arr.pop();
document.write("數(shù)組的長度為"+arr.length+",值為"+arr+"<br/>");
</script>
</head>
<body>
</body>
</html> 
