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>