基本信息
    
    
        
    
    
        
        
    
    
        
        
    
    
    
        源码名称:图片局部放大效果
源码大小:0.87M
文件格式:.rar
开发语言:js 
更新时间:2020-10-26
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       源码介绍
    
    
                                
		
			
                            
        
| <script> | |
| // OOP:编程 | |
| function Magnifier() { | |
| // 1.选元素 | |
| this.sBox = document.querySelector(".s_box"); | |
| this.span = document.querySelector(".s_box span"); | |
| this.bBox = document.querySelector(".b_box"); | |
| this.bImg = document.querySelector(".b_box img"); | |
| // 2.绑定事件 | |
| this.init() | |
| } | |
| Magnifier.prototype.init = function() { | |
| var that = this; | |
| // 进入 | |
| this.sBox.onmouseover = function() { | |
| // 3-1.显示,计算span的宽高 | |
| that.show() | |
| } | |
| // 离开 | |
| this.sBox.onmouseout = function() { | |
| // 3-2.隐藏 | |
| that.hide() | |
| } | |
| // 移动 | |
| this.sBox.onmousemove = function(eve) { | |
| var e = eve || window.event; | |
| // 5.span跟随鼠标 | |
| that.move(e) | |
| } | |
| } | |
| Magnifier.prototype.show = function() { | |
| // 显示,计算span的宽高 | |
| this.span.style.display = "block"; | |
| this.bBox.style.display = "block"; | |
| this.span.style.width = this.bBox.offsetWidth / this.bImg.offsetWidth * this.sBox.offsetWidth "px"; | |
| this.span.style.height = this.bBox.offsetHeight / this.bImg.offsetHeight * this.sBox.offsetHeight "px"; | |
| } | |
| Magnifier.prototype.hide = function() { | |
| // 隐藏 | |
| this.span.style.display = "none"; | |
| this.bBox.style.display = "none"; | |
| } | |
| Magnifier.prototype.move = function(e) { | |
| // 计算移动的距离 | |
| var l = e.clientX - this.span.offsetWidth / 2; | |
| var t = e.clientY - this.span.offsetHeight / 2; | |
| console.log(this.sBox.offsetTop); | |
| // 边界限定 | |
| if (l < 0) l = 0; | |
| if (t < 0) t = 0; | |
| if (l > this.sBox.offsetWidth - this.span.offsetWidth) { | |
| l = this.sBox.offsetWidth - this.span.offsetWidth | |
| } | |
| if (t > this.sBox.offsetHeight - this.span.offsetHeight) { | |
| t = this.sBox.offsetHeight - this.span.offsetHeight | |
| } | |
| // span跟随鼠标 | |
| this.span.style.left = l "px"; | |
| this.span.style.top = t "px"; | |
| // 计算比例 | |
| // 当前值 / 总值,得到的就是比例 | |
| var x = l / (this.sBox.offsetWidth - this.span.offsetWidth); | |
| var y = t / (this.sBox.offsetHeight - this.span.offsetHeight); | |
| // 根据比例计算右边大图应该移动的距离 | |
| // 比例 * 总值,得到的就是当前应该移动的距离 | |
| this.bImg.style.left = x * (this.bBox.offsetWidth - this.bImg.offsetWidth) "px"; | |
| this.bImg.style.top = y * (this.bBox.offsetHeight - this.bImg.offsetHeight) "px"; | |
| } | |
| new Magnifier(); | |
| </script> |