莜面馒头

摘要： index:从0开始的数组下标; length:数组长度; prototype:数组原型属性; 数组常用方法 concat:连接数组; 示例: arr1 = [1,2,3]; arr2 = [4,5,6]; arr1.concat(arr2) = [1,2,3,4,5,6]; join():将数组转 阅读全文