浏览器对象模型(Browser Object Model,简称BOM)定义了与浏览器进行交互的方法和接口,BOM与DOM不同,其既没有标准的实现,也没有严格的定义, 所以浏览器厂商可以自由地实现BOM。BOM由多个对象组成,其中代表浏览器窗口的Window对象是BOM的顶层对象,其他对象都是该对象的子对象。 1.2、JavaScript特点 JavaScript主要被作为客...
而 JavaScript 就像一台精妙运作的机器,通过 AST 解析,我们也可以像童年时拆解玩具一样,深入了解 JavaScript 这台机器的各个零部件,然后重新按照我们自己的意愿来组装。 AST 的用途很广,IDE的语法高亮、代码检查、格式化、压缩、转译等,都需要先将代码转化成 AST 再进行后续的操作,ES5 和 ES6 语法差异,为了向后兼...
// 声明并初始化一个变量var v = 5;/* 使用 for 循环输出 Hello5 次 */document.write("Hello!");document.write("Hello!");document.write("Hello!");document.write("Hello!");document.write("Hello!");/* 这些注释不会显示在页面上, 但是可以通过页面的源代码查看到 */ 1.3 顺序结构和选...
// We are allowing the caller to pass in an array where the first index is the left eye and the 2nd is the right // This is for convenience to make it easier for them. // Or they can just pass in the eyes using the correct format if they want to // We must transform it into...
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不能是关键字和保留字,例如:for、while 区分大小写 规范-建议遵守的,不遵守不会报错 变量名必须有意义 遵守驼峰命名法,首字母小写,后面单词的首字母需要大写,例如:userName、userPasswd 案例 交换2个变量的值 思路1:使用三方的变量进行交换 思路2:一般适用于数字的交换 ...
Enable manually with: $('.collapse').collapse() Options Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-parent="". Nametypedefaultdescription parent selector false If a selector is provided, then all collapsible elemen...
to the object’s properties (the current property in this example). When the user clicks on the previous or next buttons, we simply change the index of the current person to be shown and let the bind handler process the data-win-bind attributes for the HTML that shows the current person...
Since: ArcGIS Maps SDK for JavaScript 4.21 Creates a subclass of the class calling this method. Parameter classDefinition Object An object with properties and methods to mix in to the newly created class. Returns TypeDescription Accessor Returns a constructor of the newly created class. hasHan...
Returns the item at the specified index, allowing for positive and negative integers. Collection clone() Collection Creates a deep clone of the Collection. Collection concat() Collection Creates a new Collection containing the items in the original Collection joined with the items in the input arr...