let array = [2,1,3,5,6,7,8,9];
for(let i = 0;i < array.length; i++){
console.log(array[i]);
}
2.for…in…循环
for(let i in array) {
console.log(array[i]);//i代表索引号
}
for(let i in stu) {
console.log(i + "::" + stu[i]);//i代表键
}
3.for…of…循环，类似java的foreach
for (let i of array){
console.log(i);//i表示值
}
4.使用forEach函数遍历
array.forEach(x => console.log(x));
