数组中的方法

var arr=[1,3];
 arr.push(4);
 console.log(arr);

var arr=[1,3];
 var a=arr.push('fsdfsd');
 console.log(a);

 var arr=[1,3];
 arr.unshift(0); //ie6 7不支持
 console.log(arr);

var arr=['a','b','c','d'];
arr.pop();
arr.shift();
console.log(arr);

var arr=['a','b','c','d'];
arr.splice(0,1);
console.log(arr);

var arr=['a','b','c','d'];
arr.splice(0,1,'aa');
console.log(arr);

var arr=['a','b','c','d'];
arr.splice(1,0,'bb');
console.log(arr);

//数组去重
    var arr=[1,3,5,5,7,7,7,5,3,1];
    for(var i=0;i<arr.length;i++){
        for(j=i+1;j<arr.length;j++){
            if(arr[i]==arr[j]){
                arr.splice(j,1);
                j--;
            }
        }
    }
    console.log(arr);

var a=["b", "n"];
var string=a.join(',');
console.log(string);

           var str=['a','f','g','b'];
            console.log(str.sort());