javascript基础之for循环

1、数组定义声名

    var arry = [1,2,3,4,5]
   //相当与var arry = Array(1,2,3,4,5) 

2、数据的增删改查

var arry = [1,2,3,4,5]

arry.push('gjlin');
console.log(arry);
arry.unshift('old');
console.log(arry);
arry.splice(1,0,'girl');
arry.splice(100,0,'OK')
console.log(arry);
arry[100] = 'kk'
console.log(arry[100]);

3、for循环

var array = [1,2,3,4,5,6];
var dic = {'name':'gjlin','age':19};

for(var item in array){
console.log(item);
}

for(var item in dic){
console.log(item)
}

for(var i=0;i<array.length;i++){
console.log(array[i]);
}