<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
var arr = [‘a‘,‘b‘,‘c‘];
var result = arr.join("+");
alert(result);
alert(arr.length);//var result = arr.join("+");这是一个拼接字符
//直接在中间拼接的不改变原来的数组长度，只是对字符简单的拼接
var acc = arr.reverse();
alert(acc);//物理反转
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <script type="text/javascript"> var arr = "你好呀"; alert(arr); var temp = encodeURI(arr); alert(temp); alert(decodeURI(temp)); </script> </head> <body> </body> </html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script type="text/javascript">
var arr = [1,2,3,"a",true];
var aaa = newArray();//默认长度是0
/* for(int i = 0; i < 4 ;i++)
{
alert(arr[i]);
} */
alert(arr.length);
</script>
</head>
<body>
</body>
</html>
原文：https://www.cnblogs.com/shuangshuangzi/p/15077039.html