window.event
IE:有window.event对象
FF:没有window.event对象。可以通过给函数的参数传递event对象。如onmousemove=doMouseMove(event)
鼠标当前坐标
IE:event.x和event.y。
FF:event.pageX和event.pageY。
通用:两者都有event.clientX和event.clientY属性。
鼠标当前坐标(加上滚动条滚过的距离)
IE:event.offsetX和event.offsetY。
FF:event.layerX和event.layerY。
标签的x和y的坐标位置:style.posLeft 和 style.posTop
IE:有。
FF:没有。
通用:object.offsetLeft 和 object.offsetTop。
窗体的高度和宽度
IE:document.body.offsetWidth和document.body.offsetHeight。注意:此时页面一定要有body标签。
FF:window.innerWidth和window.innerHegiht,以及document.documentElement.clientWidth和document.documentElement.clientHeight。
通用:document.body.clientWidth和document.body.clientHeight。
添加事件
IE:element.attachEvent(”onclick”, func);。
FF:element.addEventListener(”click”, func, true)。
通用:element.onclick=func。虽然都可以使用onclick事件,但是onclick和上面两种方法的效果是不一样的,onclick只有执行一个过程,而attachEvent和addEventListener执行的是一个过程列表,也就是多个过程。例如:element.attachEvent(”onclick”, func1);element.attachEvent(”onclick”, func2)这样func1和func2都会被执行。
标签的自定义属性
IE:如果给标签div1定义了一个属性value,可以div1.value和div1[”value”]取得该值。
FF:不能用div1.value和div1[”value”]取。
通用:div1.getAttribute(”value”)。
父节点、子节点和删除节点
IE:parentElement、parement.children,element.romoveNode(true)。
FF:parentNode、parentNode.childNodes,node.parentNode.removeChild(node)。

JavaScript core data types are consistent in browsers and Node.js, but are handled differently from the extra types. 1) The global object is window in the browser and global in Node.js. 2) Node.js' unique Buffer object, used to process binary data. 3) There are also differences in performance and time processing, and the code needs to be adjusted according to the environment.

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The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

Choosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.


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