SOURCE

function writeDocument(variable){
    document.write(variable+"<br/>");


}
var arr=["dsdadada","dddd","ssss"];
writeDocument(arr);
writeDocument("数组长度"+arr.length);
writeDocument("获取数组的1-2号元素"+arr.slice(1,3));
writeDocument("往数组头添加元素");
writeDocument(arr.unshift("dd","yy"));
writeDocument(arr);
writeDocument("往数组尾部添加元素-");
writeDocument(arr.push("bb","sss"));
writeDocument("删除数组的第一个元素");
writeDocument("删除元素"+arr.shift());
writeDocument(arr);
writeDocument("删除数组的最后一个元素"); 
writeDocument("删除元素"+arr.pop());
writeDocument(arr);
writeDocument("升序排列");
writeDocument(arr.sort());
var numArr=[3,4,5,6,8,6,1];

function upCompare(left,right){
        if(left-right>0){
            return 1;
        }
        if(left-right==0){
            return 0;
        }
        if(left-right<0){
            return -1;
        }

}
function downCompare(left,right){
        if(left-right>0){
            return -1;
        }
        if(left-right==0){
            return 0;
        }
        if(left-right<0){
            return 1;
        }

}
writeDocument("刚刚开始排列"+numArr);
writeDocument("升序"+numArr.sort(upCompare));
writeDocument("降序"+numArr.sort(downCompare));
writeDocument("反转数组"+numArr.reverse());
writeDocument(numArr.join(";"));
writeDocument("添加括号");