针对火狐浏览器：去除火狐自带缩放（改为默认100%大小自动居中） | 可拖拽 | 以鼠标中心缩放 | 限定最小缩放（图片大小和屏幕大小较小值的50%） | 左上角显示缩放比例，点击还原 | 可旋转、水平翻转 | 图片加载完毕后闪烁一次
当前为
// ==UserScript==
// @icon https://github.com/favicon.ico
// @name 【自用】浏览器看图 for FireFox
// @namespace Violentmonkey Scripts
// @match http*://*/*.jpg
// @match http*://*/*.jpeg
// @match http*://*/*.png
// Homepage URL https://greasyfork.org/zh-CN/scripts/428791-%E8%87%AA%E7%94%A8-jpg
// 更新页面 https://greasyfork.org/zh-CN/scripts/428791/versions/new
// @grant none
// @version 2021.07.19
// @author heckles
// @description 针对火狐浏览器：去除火狐自带缩放（改为默认100%大小自动居中） | 可拖拽 | 以鼠标中心缩放 | 限定最小缩放（图片大小和屏幕大小较小值的50%） | 左上角显示缩放比例，点击还原 | 可旋转、水平翻转 | 图片加载完毕后闪烁一次
// ==/UserScript==
//==================测试网址==============
// 1 http://www.netbian.com/
// 2 https://wallhaven.cc/
// 3 https://hdqwalls.com/
// 4 https://www.deviantart.com/wlop/gallery
function addNewStyle(newStyle) {//增加新样式表
var styleElement = document.getElementById('styles_js');
if (!styleElement) {
styleElement = document.createElement('style');
styleElement.type = 'text/css';
styleElement.id = 'styles_js';
document.getElementsByTagName('head')[0].appendChild(styleElement);
}
styleElement.appendChild(document.createTextNode(newStyle));
}
addNewStyle('\
body{margin:0;background-color:#333;} \
@-moz-keyframes flash {0%, 100% {opacity: 1;}50% {opacity: 0;}} \
');
//document.body.style.cssText = "margin:0;background-color:#333;";
var img = new Image(); // 创建一个新的img，不过也不设定属性，相当于一个备份，后台应该是加载了，会有img.width产生，而且不操作它，因此是个定量
img.src = document.getElementsByTagName("img")[0].src;// + "?" + Date.parse(new Date()); //重构地址 //看来没必要，有的网站不知道是不是防外链，重构就无法加载例如DA和wallhaven //另外位置提到最前，能避免后面函数偶尔不生效的bug
//1.1==================上面是从网上摘的=====================
//*绑定事件*/
function addEvent(obj, sType, fn) {
if (obj.addEventListener) {
obj.addEventListener(sType, fn, false);
} else {
obj.attachEvent('on' + sType, fn);
}
};
function removeEvent(obj, sType, fn) {
if (obj.removeEventListener) {
obj.removeEventListener(sType, fn, false);
} else {
obj.detachEvent('on' + sType, fn);
}
};
function prEvent(ev) {
var oEvent = ev || window.event;
if (oEvent.preventDefault) {
oEvent.preventDefault();
}
return oEvent;
}
//*添加滑轮事件*/
function addWheelEvent(obj, callback) {
if (window.navigator.userAgent.toLowerCase().indexOf('firefox') != -1) {
addEvent(obj, 'DOMMouseScroll', wheel);
} else {
addEvent(obj, 'mousewheel', wheel);
}
function wheel(ev) {
var oEvent = prEvent(ev),
delta = oEvent.detail ? oEvent.detail > 0 : oEvent.wheelDelta < 0;
callback && callback.call(oEvent, delta);
return false;
}
};
//1.1==================上面是从网上摘的=====================
var css_s = document.querySelectorAll("head > link"); //获取浏览器自带的图片css
css_s[0].href = ""; //删了，要不有冲突
css_s[1].href = ""; //删了，要不有冲突
css_s[2].href = ""; //删了，要不有冲突
//var pichref = window.location.href;//获取当前网址，也就是图片地址
var imgs = document.getElementsByTagName("img");
var img0 = imgs[0]; //获取默认图片
img0.style.cssText = "display:none;height:0px" //隐藏默认图片
var pic_xx = document.createElement("img"); //创建img
document.body.appendChild(pic_xx); //div加到页面最后
pic_xx.setAttribute("Id", "pic_xx_img"); //定ID
pic_xx.style.cssText = "box-shadow: 0px 2px 6px rgba(0,0,0,0.12), 0px 1px 2px rgba(0,0,0,0.24) !important;position:absolute;z-index:1;";//拖拽函数运行之前就得定义position，要不拖不了
pic_xx.src = window.location.href;
//1.2======本来是window.onload = function(){};后来发现img.onload也行，但是都得图片完全加载之后才能拖动和缩放，干脆去了，图片开始加载也就是定义网址后，直接执行========================================
var oImg = document.getElementById('pic_xx_img'); //【【】【】【】【此处自己改】【】【】【】【】】
/*拖拽功能*/
(function () {
addEvent(oImg, 'mousedown', function (ev) {
var oEvent = prEvent(ev),
oParent = oImg.parentNode,
disX = oEvent.clientX - oImg.offsetLeft,
disY = oEvent.clientY - oImg.offsetTop,
startMove = function (ev) {
if (oParent.setCapture) {
oParent.setCapture();
}
var oEvent = ev || window.event,
l = oEvent.clientX - disX,
t = oEvent.clientY - disY;
oImg.style.left = l + 'px';
oImg.style.top = t + 'px';
oParent.onselectstart = function () {
return false;
}
},
endMove = function (ev) {
if (oParent.releaseCapture) {
oParent.releaseCapture();
}
oParent.onselectstart = null;
removeEvent(oParent, 'mousemove', startMove);
removeEvent(oParent, 'mouseup', endMove);
};
addEvent(oParent, 'mousemove', startMove);
addEvent(oParent, 'mouseup', endMove);
pic_xx.style.transitionDuration = "0s";//缩放时过渡关了，要不不跟手
return false;
});
})();
//*以鼠标位置为中心的滑轮放大功能*/
(function () {
addWheelEvent(oImg, function (delta) {
var ratioL = (this.clientX - oImg.offsetLeft) / oImg.offsetWidth,
ratioimg = oImg.width/oImg.height,//!!!这里是自己修改的，限定最小缩放
ratioT = (this.clientY - oImg.offsetTop) / oImg.offsetHeight,
ratioDelta = !delta ? 1 + 0.1 : 1 - 0.1,
w = Math.max(parseInt(oImg.offsetWidth * ratioDelta), Math.min(0.5*window.innerWidth,0.5 * screen.width, 0.5 * img.width)), //!!!这里是自己修改的，限定最小缩放
h = Math.max(parseInt(oImg.offsetHeight * ratioDelta), Math.min(0.5*window.innerWidth/ratioimg,0.5 * screen.width/ratioimg, 0.5 * img.height)), //!!!这里是自己修改的，限定最小缩放
l = Math.round(this.clientX - (w * ratioL)),
t = Math.round(this.clientY - (h * ratioT));
with (oImg.style) {
width = w + 'px';
height = h + 'px';
left = l + 'px';
top = t + 'px';
btn100.innerHTML = (w/img.width*100).toFixed(0) + "%";
btn100.style.backgroundColor = "#2D8CF0";
pic_xx.style.transitionDuration = "0s";//缩放时过渡关了，要不不跟手
}
});
})();
//1.2==================================================================================================================================================================================
function align100(){// 加载完成执行
var le = 0.5*(window.innerWidth - img.width);
var to = 0.5*(window.innerHeight - img.height);
pic_xx.style.cssText = "box-shadow: 0px 2px 6px rgba(0,0,0,0.12), 0px 1px 2px rgba(0,0,0,0.24) !important;\
position:absolute;z-index:1;\
left:"+le+"px;top:"+to+"px;"
btn100.style.backgroundColor = "#FFF";
currentrt = 0;//清零一下旋转
currentfl = 0;//清零一下旋转
btn100.innerHTML = "100%";
}
//align100;
pic_xx.onload = function(){
align100();
pic_xx.style.animation = "flash 2s .2s ease both";//加载完成之后加一个CSS动画，缺点是只能一次，配合最开始的@-moz-keyframes
}
var btnstyle = "border: none !important;\
width:60px;\
font-size: 14px !important;\
font-weight: 200 !important;\
letter-spacing: 0em !important;\
line-height: 0em !important;\
height:24px !important;\
display: inline-block !important;\
outline: 0 !important;\
padding: 0px 12px !important;\
margin-top: 0px !important;\
margin-bottom: 10px !important;\
vertical-align: middle !important;\
overflow: hidden !important;\
text-decoration: none !important;\
color: #fff !important;\
text-align: center !important;\
transition: .2s ease-out !important;\
cursor: pointer !important;\
white-space: nowrap !important;\
box-shadow: 0px 2px 6px rgba(0,0,0,0.12), 0px 1px 2px rgba(0,0,0,0.24) !important;\
border-radius: 2px !important;\
opacity:0.3;";
//定义按钮的CSS
var btn100 = document.createElement("button"); //创建一个按钮
btn100.setAttribute("Id", "btn100"); //定义按钮ID
document.body.appendChild(btn100); //把按钮加到页面
btn100.style.cssText = "z-index:2;position:fixed;top:20px;left:20px;background-color: #2D8CF0;width:60px;opacity:0.3;" + btnstyle;//确定按钮位置
btn100.onmouseover = function(){btn100.style.opacity = "1";}
btn100.onmouseout = function(){btn100.style.opacity = "0.3";}
btn100.innerHTML = "100%"; //按钮文本
btn100.onclick = align100; //给按钮加函数
var btnrt = document.createElement("button"); //创建一个按钮
btn100.setAttribute("Id", "btnrt"); //定义按钮ID
document.body.appendChild(btnrt); //把按钮加到页面
btnrt.style.cssText = "z-index:1;position:fixed;top:50px;left:20px;background-color: #FC5531;" + btnstyle; //改变按钮位置
btnrt.onmouseover = function(){btnrt.style.opacity = "1";}
btnrt.onmouseout = function(){btnrt.style.opacity = "0.3";}
btnrt.innerHTML = "rotate"; //按钮文本
var currentrt = 0;//这里必须赋值，还得在函数外面
var currentfl = 0;//这里必须赋值，还得在函数外面
btnrt.onclick =function rotate90(){
currentrt = currentrt + 90;
pic_xx.style.transform = 'rotate('+ currentrt +'deg)';
pic_xx.style.transitionDuration = "0.3s";//加一个过渡，没那么楞
}
var btnfl = document.createElement("button"); //创建一个按钮
btnfl.setAttribute("Id", "btnrt"); //定义按钮ID
document.body.appendChild(btnfl); //把按钮加到页面
btnfl.style.cssText = "z-index:1;position:fixed;top:80px;left:20px;background-color: #FC5531;" + btnstyle; //改变按钮位置
btnfl.onmouseover = function(){btnfl.style.opacity = "1";}
btnfl.onmouseout = function(){btnfl.style.opacity = "0.3";}
btnfl.innerHTML = "flip H"; //按钮文本
var current = 0;//这里必须赋值，还得在函数外面
btnfl.onclick =function flip180(){
currentfl = currentfl + 180;
pic_xx.style.transform = 'rotateY('+ currentfl +'deg)';
pic_xx.style.transitionDuration = "0.3s";//加一个过渡，没那么楞
}