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                [TOC] ## **js內置函數有哪些** 1. 內置函數是數據封裝類對象。里面封裝有屬性和方法供其他類(函數)繼承 2. 有11種 Number,String,Boolean,Undefined,Object, Function,Array,Date,Error,Regexp(正則),Math ~~~ Math.ceil()上取整 Math.floor()下取整 Math.round()四舍五入取整 Math.random()取0-1的隨機數, 左閉右開 Math.max()取最大值 Math.min()取最小值 ~~~ ## **介紹js的基本數據類型** Undefined、Null、Boolean、Number、String、 > ECMAScript 2015 新增:Symbol(創建后獨一無二且不可變的數據類型 ) * * * ## js常用的數組操作**內置函數** (添加)push,unshift、(刪除)pop、shift、(轉換)join、(排序)reverse、sort、(連接)concat...... ## javascript中幾種為false的值: undefined、null、false、0、NaN、""或''(空字符串)
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