focusout:与 blur 等价,也冒泡。 支持focusin、focusout 的浏览器有:IE5.5+、Safari 5.1+、Opera 11.5+和Chrome。但只支持 DOM2 级事件处理程序 Firefox 不支持 focusin、focusout blur、focusout 的事件目标是失去焦点的元素;focus、focusin 的事件目标是获得焦点的元素 鼠标与滚轮事件 click在用户单击住鼠标按钮或...
= { // element是当前元素,可以通过getElementById(id)获取 // type 是事件类型,一般是click ,也有可能是鼠标、焦点、滚轮事件等等 // handle 事件处理函数 addHandler: (element, type, handler) => { // 先检测是否存在DOM2级方法,再检测IE的方法,最后是DOM0级方法(一般不会到这) if (element.addEventLi...
function getThis()( console.log(this) } getThis(); //returns Window {postMessage: ƒ, blur: ƒ, focus: ƒ, close: ƒ, frames: Window, ...} Listing 5-2Get the Current Context of a Function in the Global Scope 代码中调用函数的地方称为执行上下文。执行上下文决定了this 的值。注...
可以使用如下方式判断一个javaScript函数是否存在, if(typeof document.getElementById == 'function'){}。此外type(xxx)的返回值还包括,'number'操作数为数值;'string'操作数字符串;'boolean'表示布尔类型;'object'表示对象;undefined/null表示未定义/null。 JSON是JavaScript对象的一种简单紧凑的标签,使用JSON时,...
If a function is given, it will be called with its this reference set to the element that the tooltip is attached to. trigger string 'hover focus' How tooltip is triggered - click | hover | focus | manual. You may pass multiple triggers; separate them with a space. manual cannot be ...
一个完整的javascript实现由3个部分组成:核心ECMAScript,文档对象模型DOM,浏览器对象模型BOM。 JavaScript是一种直译式脚本语言,是一种动态类型,弱类型,基于原型的语言,内置支持类型。 JavaScript具有特点:一种解释性脚本语言,主要用于向HTML页面添加交互行为,可以直接嵌入HTML页面,但写成单独的js文件有利于结构和行为的分...
例如:vari=0;while(i<10){console.log(i);i++;}26、withwith是JavaScript中的一个关键字,它用于...
If a function is given, it will be called with its this reference set to the element that the tooltip is attached to. trigger string 'hover focus' How tooltip is triggered - click | hover | focus | manual. You may pass multiple triggers; separate them with a space. manual cannot be ...
The activeElement returns the currently focused element in the document. The following example demonstrates how you can use the activeElement property to check if the element with class name .name has focus: const elem = document.querySelector('.name'); if (elem === document.activeElement...
document.getElementById("myBtn").onclick= displayDate; Try it Yourself » In the example above, a function nameddisplayDateis assigned to an HTML element with theid="myBtn". The function will be executed when the button is clicked. The onload...