js鼠标点击添加图标并获取图标的坐标值

给这个图片添加摄像头图标，并获取图标的坐标值，也就是图标的css样式是positon:absolute,获取left和top的值。
图片1

思路是这样的，获取这里的长度，
图片2

1.鼠标点击时距浏览器的左边距离和上边距离，相当于(0,0)坐标

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let x = e.clientX;
let y = e.clientY;

2.图片距浏览器顶部的距离

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let imgTop = $('.imageBox img').offset().top;
let imgLeft = $('.imageBox img').offset().left;

3.就能获取到图片2中箭头的距离，即鼠标点击的位置距背景图顶部的距离

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let cursorTop = y - imgTop;
let cursorLeft = x - imgLeft;

4.计算得出图标的left和top值，这里是%。

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let width = $('.imageBox img').width();
let height = $('.imageBox img').height();
let left = (cursorLeft/width*100).toFixed(2)
let top = (cursorTop/height*100).toFixed(2)

5.效果如下图，但是鼠标点击处是图标的左上角，感觉好像是差一点

6.应该让鼠标点击处是图标的中心，就需要获取图标中心的坐标，然后减去图片2中箭头的距离。

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//设置添加的小图标的center为中心点
let  pointLeft = $('.imageBox .block').width()*0.5;
let  pointTop = $('.imageBox .block').height()*0.5;

//鼠标点击无差距
let xData = cursorLeft - pointLeft;
let yData = cursorTop - pointTop;

完整代码如下

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> <style> .imageBox{ width: 800px; position: relative; overflow: hidden; margin: 5% 2%; } .imageBox img{ width: 100%; height: 100%; } .imageBox .block{ width: 3%; height: 4%; background: url(camera.png) 0 0 no-repeat; background-size: 100% 100%; position: absolute;

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 	}
 	</style>
 </head>
 <body>
 	<div class="page">
 		<div class="imageBox">
 			<img src="https://img0.baidu.com/it/u=3593454291,2854711423&fm=253&fmt=auto&app=138&f=JPEG?w=800&h=500" >
 			<div class="block">

 			</div>
 		</div>
 	</div>
 	<script src="jquery.min.js" type="text/javascript" charset="utf-8"></script>
 	<script type="text/javascript">
 		$('.imageBox').click(function(e){
 			//鼠标点击时距浏览器的左边距离和上边距离，相当于(0,0)坐标
 			let x = e.clientX;
 			let y = e.clientY;

 			//图片的宽高
 			let width = $('.imageBox img').width();
 			let height = $('.imageBox img').height();

 			//图片距浏览器顶部的距离
 			let imgTop = $('.imageBox img').offset().top;
 			let imgLeft = $('.imageBox img').offset().left;

 			//鼠标点击的位置距背景图顶部的距离
 			let cursorTop = y - imgTop;
 			let cursorLeft = x - imgLeft;

 			//设置添加的小图标的center为中心点
 			let  pointLeft = $('.imageBox .block').width()*0.5;
 			let  pointTop = $('.imageBox .block').height()*0.5;

 			//鼠标点击无差距
 			let xData = cursorLeft - pointLeft;
 			let yData = cursorTop - pointTop;


 			let left = (xData/width*100).toFixed(2)
 			let top = (yData/height*100).toFixed(2)
 			console.log(x);
 			console.log(y);
 			// let html = `<div class="block" style="top: ${top}%;left: ${left}%;"></div>`
 			// $('.imageBox').append(html);
 			$('.imageBox .block').css({'top':top+'%'})
 			$('.imageBox .block').css({'left':left+'%'})

 		})
 	</script>
 </body>

</html>