1.var arr = new Array(數(shù)值);

arr[0] = "值";

創(chuàng)建數(shù)組對(duì)象，指定數(shù)組的個(gè)數(shù)，然后通過下標(biāo)依次賦值

2.var arr = new Array("值","值",……);

創(chuàng)建數(shù)組對(duì)象，直接賦值

3.var arr = ["值","值",……];

創(chuàng)建變量，通過中括號(hào)直接賦值

JavaScript可以給數(shù)組的下標(biāo)命名

arr["命名"] = "值";