1.for循環
var list = [1,2,3,4,5];
for (var i = 0; i < list.length; i ++) {
console.log(list[i]); // 1 2 3 4 5
}
2.foreach遍歷(可以同時取出數組中的值和值對應的下標)
let arr = [1,2,3];
arr.forEach(function(i,index){
console.log(i,index) // 1 0 2 1 3 2
})
3.for --- of遍歷
var arr = [1,2,3,4,5];
for(var item of arr){
console.log(item); //1 2 3 4 5
}
4.for --- in遍歷(常見用在對象中,遍歷對應的key值和value值)
var person = {name: 'kreme', age: 22, sex: 'man', hobby: 'running'};
for(key in person){
console.log(key,':',person[key]);
}
//輸出爲:name: 'kreme', age: 22, sex: 'man', hobby: 'running'
5.map循環
var arr = [1,2,3,4,5];
arr.map(function (item) {
console.log(item); // 1 2 3 4 5
}
6.every循環
var arr = [1,2,3,4,5];
arr.every(function (item) {
console.log(item); // 1 2 3 4 5
}
7.some循環
var arr = [1,2,3,4,5];
arr.some(function (item) {
console.log(item); // 1 2 3 4 5
}
8.filter循環
var arr = [1,2,3,4,5];
arr.filter(function (item) {
console.log(item); // 1 2 3 4 5
}
9.foreach循環
var arr = [1,2,3,4,5];
arr.foreach(function (item) {
console.log(item); // 1 2 3 4 5
}