數(shù)組有個(gè)屬性稱為長(zhǎng)度,正如字面意思,這就是數(shù)組的長(zhǎng)度。
var array = [1 , 2, 3];
// 結(jié)果: l = 3
var l = array.length;
{% exercise %} 定義變量a為數(shù)組的長(zhǎng)度 {% initial %} var array = [1, 1, 2, 3, 5, 8]; var l = array.length; var a = {% solution %} var array = [1, 1, 2, 3, 5, 8]; var l = array.length; var a = 6; {% validation %} assert (a === 6) {% endexercise %}