?var arr = ["*","**","***","****"];arr.length=8;//創(chuàng)建數(shù)組?alert("數(shù)組arr 的length 長度是："+ arr.length );為什么要寫成?var arr = ['*','##',"***","&&","****","##*"]; arr[7] = "**"; ?//顯示數(shù)組長度 ?alert("數(shù)組arr 的length 長度是："+ arr.length ); ? ?
JS問題?。?！* ** *** **** 排列！求教??！
北語
2017-03-29 15:28:38
