onClick中的“this”如何工作？(How does “this” in onClick work?)

 我是新来的JavaScript。 我很好奇浏览器如何使onClick属性起作用。 你有这样的HTML： 
 
<button id="1" onClick="reply_click(this.id)">B1</button>
 
 浏览器执行什么（allways javascript？）脚本功能？ 
 
 我想这是类似评估给予onClick的字符串。 
 
 但我怀疑这些：这里的适用标准是什么？ 浏览器如何知道使用哪种脚本语言？ javascript引擎是如何填充的？ 脚本在什么情况下执行？ 返回值会发生什么？ 我想读什么知道在使用这些属性时可以依靠什么？ 
 
 你能帮我理解发生了什么吗？ 

I'm new to javascript. I'm curious how does the browser makes an onClick attribute work. You have this in a html:
 
<button id="1" onClick="reply_click(this.id)">B1</button>
 
what does a browser do to execute a the (allways javascript?) script function?
 
I guess this is something like eval-ing the string that is given to the onClick. 
 
But I have doubts like these: What is the applying standard here? How does the browser know which script language to use? How is this filled up by the javascript engine? In what context does the script execute? What happens with a return value? What do I want to read to know what can I rely on when working with these attributes?
 
Can you help me to understand what's going on?

原文：https://stackoverflow.com/questions/19589220