<html>
<head>
<title> An array of concat() methods </title>
<script>
var arr1 = [123,"aaa"];
var arr2 = [false,333];
var arr3 = [true,"ddd"];
//You can continue to concatenate arrays or other elements
document.write(arr1.concat(arr2,arr3,"vvv") + "<br/>");//123,aaa,false,333,true,ddd,vvv
//The original array has not changed
document.write(arr1);//123,aaa
</script>
</head>
<body>
<div id="time"></div>
</body>
</html>