效果：

HTML代码：

复制代码 代码如下:

<div class="vfx-image-wrap special">

<div class="before-image" >

<img src="js/VFX-before.jpg">

</div>

<div class="after-image">

<img src="js/VFX-after.jpg">

</div>

<div class="divider-bar" ></div>

</div>

JS代码：

复制代码 代码如下:

$(function () {

//外DIV

var imageWrap = $('.vfx-image-wrap'),

//前景图

topImage = $(this).find('.before-image'),

//分割线

divider = $(this).find('.divider-bar'),

stayBounce = $('.toggle-function');

imageWrap.on("mousemove", function (e) {

// Gotta localize top image and divider so it only applies to this

var offsets = $(this).offset(),

fullWidth = $(this).width(),

mouseX = e.pageX - offsets.left,

topImage = $(this).find('.before-image'),

divider = $(this).find('.divider-bar');

if (mouseX < 0) {

mouseX = 0;

} else if (mouseX > fullWidth) {

mouseX = fullWidth

}

$(this).addClass('special');

divider.css({ left: mouseX, transition: 'none' });

topImage.css({ width: mouseX, transition: 'none' });

});

stayBounce.click(function(){

$(this).toggleClass('stay');

});

imageWrap.on("mouseleave", function () {

if (!stayBounce.hasClass('stay')) {

divider.css({ left: '50%', transition: 'all .3s' });

topImage.css({ width: '50%', transition: 'all .3s' });

}

});

});