var first= [1, 2];
var second= [3, 4, 5];
document.write("第一个数组:"+first+"<br>");
document.write("第二个数组:"+second+"<br>");
var sum= first.concat(second);
document.write( "合并结果:" + sum+"<br>");
var three= [6, 7, 8];
document.write("第三个数组:"+three+"<br>");
var arr4 = first.concat( second,three);
document.write("合并多个数组:" +arr4+"<br>") ;
var fruits = ["Banana", "Orange", "Lemon", "Apple", "Mango"];
document.write(fruits + '<br>');
var citrus = fruits.slice(1);//一个参数,从"orange"开始到结尾切出
var citrus = fruits.slice(3);//从"Apple"开始到结尾切出
document.write( citrus + "<br>" );
console.log(citrus[0]);//返回Orange
//slice() 从开始位置到结束位置切出,不包括结束位置。
var citrus = fruits.slice(1,3);
document.write("可接受两个参数" + citrus);//Orange,Lemon