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                ## Global對象 不存在的對象,但是所有的東西都是他的屬性和方法 Global內置的屬性和方法:web中用繼承他的window代替 ### 1.URI編碼方法 * encodeURI * encodeURIComponent //對任何非標準字符都會編碼,更徹底,使用頻率更高。 * decodeURI * decodeURIComponent ~~~ var box="1213"; encodeURI(box); ~~~ ### 2. eval()方法 字符串解析作用 ~~~ eval('alert("abcd")'); ~~~ ### 3.Global對象的屬性 Undefined,Boolean,Array............... ### 4.window對象 ## Math對象 ![](https://box.kancloud.cn/fed6b5765afc4b3bfd7c4d2dbfc2d7b6_667x241.png) ![](https://box.kancloud.cn/7d4764a320b1c1dd596e85802540e406_651x190.png) * min() //數組最小值 Math.min(3,3,57,5,8); * max() * ceil() //向上取整 * floor() //向下取整 * round() //四舍五入 * random() //0-1之間的隨機數 `Math.floor(Math.random()*總個數+最小的值);` ![](https://box.kancloud.cn/5aff17ed2d8c34a7a90663ecd039c98c_687x515.png)
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