var str = "窗口左边距离："+e.clientX+"，窗口顶边距离："+e.clientY;
str += "\n网页左边距离："+e.pageX+"，网页顶边距离："+e.pageY;
str += "\n屏幕左边距离："+e.screenX+"，屏幕顶边距离："+e.screenY;
str += "\n事件类型："+e.type;
谢谢！
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Regarding JS, += connection string, why must we add str += in front to connect? -PHP Chinese website Q&A-About JS, += connection string, why must we add str += in front to connect? -PHP Chinese website Q&A
Let’s take a look and learn.
str +=字符串 等于 str =str+字符串 这两个语句是相等的
上面的意思是把字符串加在str后面，组成一个整体的字符串
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Regarding JS, += connection string, why must we add str += in front to connect? -PHP Chinese website Q&A-About JS, += connection string, why must we add str += in front to connect? -PHP Chinese website Q&A
Let’s take a look and learn.
str +=字符串 等于 str =str+字符串 这两个语句是相等的
上面的意思是把字符串加在str后面，组成一个整体的字符串