(1)数组length属性
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>数组</title> </head> <script type="text/javascript"> var arr=[1,2,3,4,5,6]; alert(arr.length); </script> <body> </body> </html>
设置数组的具体几个
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>数组</title> </head> <script type="text/javascript"> var arr=[1,2,3,4,5,6]; arr.length=3; alert(arr); </script> <body> </body> </html>
数组既可以获取，还可以设置
(3)快速清空数组
(4)数组的方法
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>数组</title> </head> <script type="text/javascript"> var arr=[1,2,3]; /*为数组结尾添加元素*/ arr.push(4); alert(arr); /*为数组结尾删除元素*/ arr.pop(); alert(arr); /*在数组头部添加元素*/ arr.shift(); alert(arr); /*在数组头部删除元素*/ arr.unshift(); alert(arr); </script> <body> </body> </html>
不是在中间部分的添加和删除元素：先删除，再添加
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>数组</title> </head> <script type="text/javascript"> var arr=[1,2,3,4,5,6]; /*插入splice(起点，长度，元素...)*/ arr.splice(2,0,'a','b','c'); alert(arr); </script> <body> </body> </html>
数组的操作：连接
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>数组</title> </head> <script type="text/javascript"> var a=[1,2,3]; var b=[4,5,6]; alert(a.concat(b)); </script> <body> </body> </html>
数组连接符：join
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>数组</title> </head> <script type="text/javascript"> var arr=[1,2,3,4]; alert(arr.join('- -p')); </script> <body> </body> </html>
数组的排序：sort
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>数组</title> </head> <script type="text/javascript"> var arr=['float','width','alpha','zoom','left']; arr.sort(); alert(arr); </script> <body> </body> </html>
数组数字排序：sort加函数（比较函数
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>数组</title> </head> <script type="text/javascript"> var arr=[12,8,99,19,112]; arr.sort(function(n1,n2){ return n1-n2; }); alert(arr); </script> <body> </body> </html>
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