js中列表元素for循环

for (let i = 0; i < array.length; i++) {
    if (i >= array.length) break;
    console.log(array[i]);
}

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

for (let index in array) {
    if (array.hasOwnProperty(index)) {
        console.log(array[index]);
    }
}

const array = [1, 2, 3, 4, 5];

// 标准 for 循环
for (let i = 0; i < array.length; i++) {
    console.log(array[i]);
}

// 增强型 for 循环 (for...of)
for (let element of array) {
    console.log(element);
}

// 避免数组索引越界
for (let i = 0, len = array.length; i < len; i++) {
    console.log(array[i]);
}

// 避免使用 for...in 遍历数组
for (let index in array) {
    if (array.hasOwnProperty(index)) {
        console.log(array[index]);
    }
}