我对下面的图片裁剪脚本有疑问。
它适用于桌面，但不适用于所有移动浏览器。 目前，我已经编制了一份工作与不工作的移动浏览器列表。
获得一些有趣的结果：
工作：
默认galaxy手机互联网应用/没有 Chrome mobile / no -yes更新时 - Firefox移动/是的 Opera mini手机/没有 Opera mobile /是的 Safari /否
每个浏览器都会显示要裁剪的图像，但并非所有浏览器都会显示需要使用的红色裁剪矩形选择。
我已经包含了所有需要的代码以及指向我网站上的实时版本的链接。 会把它放在一支笔中，但不确定移动设备是如何处理的那样。
这可能是一个webkit问题吗？我自己并不熟悉webkits。
http://www.techagesite.com/aaa3 {。} HTM
<section id="sectionDragAndDrop">
<div class="drop" id="drop">
<p>Drag & drop or click here to upload an image.</p>
</div>
<input class="file-upload hidden" id="fileUpload" type="file">
</section>
<!-- Resize image -->
<section class="hidden" id="sectionResize">
<div class="image-resize" id="imageResize"></div>
<button class="btn" id="crop"><span class='fa fa-crop'></span> Crop</button>
</section>
<!-- Insert thumbnail -->
<section class="hidden" id="sectionThumbnail">
<div class="thumbnail" id="thumbnail"></div>
</section>
<script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
* {
box-sizing: border-box;
}
html,
body {
height: 100%;
}
body {
padding: 20px;
text-align: center;
color: #111;
background-image: radial-gradient(ellipse farthest-corner at center, #7abcff 0%,#4096ee 100%);
}
img {
max-width: 100%;
}
section {
height: 100%;
}
.hidden {
display: none;
}
.drop {
position: relative;
width: 100%;
height: 100%;
font-family: Lobster, Arial, serif;
font-size: 30px;
color: #333;
background-color: rgba(255,255,255,.2);
border: 5px dashed rgba(51,51,51,.4);
cursor: pointer;
transition-properties: border;
transition-duration: 0.2s;
&.dragging,
&:hover {
border-color: rgba(51,51,51,.8);
}
p {
position: absolute;
top: 50%;
width: 100%;
margin-top: -19px;
margin-bottom: 0;
text-align: center;
}
}
.image-resize {
max-width: 800px;
margin: auto;
}
.btn {
margin-top: 20px;
padding: 8px 25px;
font-family: "Ubuntu";
font-size: 16px;
color: #fff;
background-image: linear-gradient(to bottom, #c92437 0%, darken(#c92437, 10%) 100%);
border: 0;
border-radius: 5px;
box-shadow: 1px 1px 2px rgba(0,0,0,.3);
.fa:first-child {
margin-right: 5px;
}
}
.thumbnail {
display: inline-block;
margin: auto;
padding: 5px;
background-color: rgba(255,255,255,.4);
border-radius: 5px;
img {
display: block;
border-radius: 5px;
}
}
.layout {
height: 100%;
}
.layout * {
box-sizing: border-box;
}
.layout body {
width: 100%;
height: 100%;
padding: 20px;
color: #111;
background-image: -webkit-radial-gradient(center, ellipse farthest-corner, #7abcff 0%, #4096ee 100%);
background-image: radial-gradient(ellipse farthest-corner at center, #7abcff 0%, #4096ee 100%);
}
.layout h1 {
font-family: Lobster, Arial;
text-align: center;
}
.layout .btn {
position: absolute;
right: 5px;
bottom: 5px;
z-index: 999;
padding: 6px 10px;
font-family: "Ubuntu";
font-size: 16px;
color: #fff;
background-image: -webkit-linear-gradient(top, #c92437 0%, #9e1c2b 100%);
background-image: linear-gradient(to bottom, #c92437 0%, #9e1c2b 100%);
border: 0;
border-radius: 5px;
box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}
.ic-container {
position: relative;
}
.ic-overlay-n,
.ic-overlay-e,
.ic-overlay-s,
.ic-overlay-w {
position: absolute;
background-color: #000;
opacity: 0.7;
}
.ic-overlay-n {
top: 0;
}
.ic-overlay-e {
top: 0;
right: 0;
bottom: 0;
}
.ic-overlay-s {
bottom: 0;
}
.ic-overlay-w {
top: 0;
bottom: 0;
left: 0;
}
.ic-resize-handle-ne,
.ic-resize-handle-se,
.ic-resize-handle-nw,
.ic-resize-handle-sw {
position: absolute;
width: 10px;
height: 10px;
background: #c92437;
z-index: 999;
}
.ic-resize-handle-nw {
top: -5px;
left: -5px;
cursor: nw-resize;
}
.ic-resize-handle-sw {
bottom: -5px;
left: -5px;
cursor: sw-resize;
}
.ic-resize-handle-ne {
top: -5px;
right: -5px;
cursor: ne-resize;
}
.ic-resize-handle-se {
bottom: -5px;
right: -5px;
cursor: se-resize;
}
.ic-crop-marker {
position: absolute;
z-index: 999;
border: solid 2px rgba(201, 36, 55, 0.5);
cursor: move;
}
.ic-move-handle {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
.ic-container img {
display: block;
max-width: 100%;
}
* {
box-sizing: border-box;
}
html,
body {
height: 100%;
}
body {
padding: 20px;
text-align: center;
color: #111;
background-image: -webkit-radial-gradient(center, ellipse farthest-corner, #7abcff 0%, #4096ee 100%);
background-image: radial-gradient(ellipse farthest-corner at center, #7abcff 0%, #4096ee 100%);
}
img {
max-width: 100%;
}
section {
height: 100%;
}
.hidden {
display: none;
}
.drop {
position: relative;
width: 100%;
height: 100%;
font-family: Lobster, Arial, serif;
font-size: 30px;
color: #333;
background-color: rgba(255, 255, 255, 0.2);
border: 5px dashed rgba(51, 51, 51, 0.4);
cursor: pointer;
transition-properties: border;
-webkit-transition-duration: 0.2s;
transition-duration: 0.2s;
}
.drop.dragging,
.drop:hover {
border-color: rgba(51, 51, 51, 0.8);
}
.drop p {
position: absolute;
top: 50%;
width: 100%;
margin-top: -19px;
margin-bottom: 0;
text-align: center;
}
.image-resize {
max-width: 800px;
margin: auto;
}
.btn {
margin-top: 20px;
padding: 8px 25px;
font-family: "Ubuntu";
font-size: 16px;
color: #fff;
background-image: -webkit-linear-gradient(top, #c92437 0%, #9e1c2b 100%);
background-image: linear-gradient(to bottom, #c92437 0%, #9e1c2b 100%);
border: 0;
border-radius: 5px;
box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}
.btn .fa:first-child {
margin-right: 5px;
}
.thumbnail {
display: inline-block;
margin: auto;
padding: 5px;
background-color: rgba(255, 255, 255, 0.4);
border-radius: 5px;
}
.thumbnail img {
display: block;
border-radius: 5px;
}
var imageCrop=function(e,t,i){function o(){H.onload=function(){return H.width<t||H.height<i?(console.log("Image Crop error: The required dimensions are larger than the target image."),!1):($(e).wrap('<div class="ic-container"></div>').before(' <div class="ic-overlay-n" id="icOverlayN"></div> <div class="ic-overlay-e" id="icOverlayE"></div> <div class="ic-overlay-s" id="icOverlayS"></div> <div class="ic-overlay-w" id="icOverlayW"></div> <div class="ic-crop-marker" id="icCropMarker"> <div class="ic-resize-handle-nw" id="icResizeHandleNW"></div> <div class="ic-resize-handle-ne" id="icResizeHandleNE"></div> <div class="ic-resize-handle-sw" id="icResizeHandleSW"></div> <div class="ic-resize-handle-se" id="icResizeHandleSE"></div> <div class="ic-move-handle" id="icMoveHandle"></div> </div> '),l=$("#icCropMarker"),u=$(e),f=H.width/u.width(),g=H.width/H.height,v=t/i,p=t/f,w=i/f,z(),s(),l.on("mousedown touchstart",n),l.on("mousedown touchstart","#icMoveHandle",d),void R.resolve())},H.src=e.src}function n(e){e.preventDefault(),e.stopPropagation(),C(e),m.on("mousemove touchmove",c),m.on("mouseup touchend",r)}function r(e){e.preventDefault(),m.off("mouseup touchend",r),m.off("mousemove touchmove",c)}function c(e){var o,n,r,c,d={},h=l.outerWidth(),a=l.outerHeight(),f=l.position();d.x=(e.clientX||e.pageX||e.originalEvent.touches[0].clientX)+$(window).scrollLeft(),d.y=(e.clientY||e.pageY||e.originalEvent.touches[0].clientY)+$(window).scrollTop();var g=!1,v=!1,m=!1,H=!1;$(y.evnt.target).is("#icResizeHandleSE")?g=!0:$(y.evnt.target).is("#icResizeHandleSW")?v=!0:$(y.evnt.target).is("#icResizeHandleNW")?m=!0:$(y.evnt.target).is("#icResizeHandleNE")&&(H=!0),g?(o=d.x-y.containerLeft-u.offset().left,n=o/t*i,r=y.containerLeft,c=y.containerTop):v?(o=y.containerWidth-(d.x-y.containerLeft-u.offset().left),n=o/t*i,r=d.x-u.offset().left,c=y.containerTop):m?(o=y.containerWidth-(d.x-y.containerLeft-u.offset().left),n=o/t*i,r=d.x-u.offset().left,c=f.top+a-n):H&&(o=d.x-y.containerLeft-u.offset().left,n=o/t*i,r=y.containerLeft,c=f.top+a-n),c>=0&&r>=0&&Math.round(c+n)<=Math.round(u.height())&&Math.round(r+o)<=Math.round(u.width())&&(W=!0),W&&(0>c?(n=a+f.top,o=n/i*t,c=0,m&&(r=f.left-(o-h)),W=!1):0>r?(o=h+f.left,n=o/t*i,r=0,g&&(c=f.top-(n-a)),W=!1):Math.round(c+n)>Math.round(u.height())?(n=u.height()-c,o=n/i*t,v&&(r=f.left-(o-h)),W=!1):Math.round(r+o)>Math.round(u.width())&&(o=u.width()-r,n=o/t*i,H&&(c=f.top-(n-a)),W=!1),o>p&&n>w?(l.outerWidth(o).outerHeight(n),l.css({left:r,top:c})):((v||m)&&(r-=p-o),(m||H)&&(c-=w-n),l.outerWidth(p).outerHeight(w),l.css({left:r,top:c}))),s()}function d(e){e.preventDefault(),e.stopPropagation(),C(e),m.on("mousemove touchmove",a),m.on("mouseup touchend",h)}function h(e){e.preventDefault(),m.off("mouseup touchend",h),m.off("mousemove touchmove",a)}function a(e){var t,i,o,n={};e.preventDefault(),e.stopPropagation(),o=e.originalEvent.touches,n.x=(e.clientX||e.pageX||o[0].clientX)+$(window).scrollLeft(),n.y=(e.clientY||e.pageY||o[0].clientY)+$(window).scrollTop(),t=n.y-(y.mouseY-y.containerTop),i=n.x-(y.mouseX-y.containerLeft),0>t&&(t=0),t+l.outerHeight()>u.height()&&(t=u.height()-l[0].getBoundingClientRect().height),0>i&&(i=0),i+l.outerWidth()>u.width()&&(i=u.width()-l[0].getBoundingClientRect().width),l.css({top:t,left:i}),s()}function s(){var e=u[0].getBoundingClientRect().width,t=(u[0].getBoundingClientRect().height,l.position().top),i=l.position().left,o=l[0].getBoundingClientRect().width,n=l[0].getBoundingClientRect().height;parseFloat(l.css("border-top-width"));$("#icOverlayN").css({right:e-i-o,height:t,left:i}),$("#icOverlayE").css({left:i+o}),$("#icOverlayS").css({right:e-i-o,top:t+n,left:i}),$("#icOverlayW").css({width:i})}var l,u,f,g,v,p,w,m=$(document),H=new Image,e=$(e).get(0),y={},W=!0,M=!1,R=new $.Deferred;H.crossOrigin="Anonymous",document.addEventListener("keydown",function(e){var t,i,o,t=l.position().top,i=l.position().left;o=e.shiftKey?10:1,37===e.keyCode?i-=o:38===e.keyCode?t-=o:39===e.keyCode?i+=o:40===e.keyCode&&(t+=o),0>t&&(t=0),t+l.outerHeight()>u.height()&&(t=u.height()-l[0].getBoundingClientRect().width),0>i&&(i=0),i+l.outerWidth()>u.width()&&(i=u.width()-l[0].getBoundingClientRect().width),M&&(l.css({top:t,left:i}),s())}),m.click(function(e){M=$(e.target).closest(".ic-container").length?!0:!1});var C=function(e){y.containerWidth=l.outerWidth(),y.containerHeight=l.outerHeight(),y.containerLeft=l.position().left,y.containerTop=l.position().top,y.mouseX=(e.clientX||e.pageX||e.originalEvent.touches[0].clientX)+$(window).scrollLeft(),y.mouseY=(e.clientY||e.pageY||e.originalEvent.touches[0].clientY)+$(window).scrollTop(),y.evnt=e},z=function(){v>g?(l.outerWidth(u.width()),l.outerHeight(l.outerWidth()/t*i),l.css({top:(u.height()-l.height())/2+"px",left:0})):(l.outerHeight(u.height()),l.outerWidth(l.outerHeight()/i*t),l.css({left:(u.width()-l.width())/2+"px",top:0}))};this.crop=function(){var e,o=new Image,n=H.width/u.width(),r=Math.round(l.position().left*n),c=Math.round(l.position().top*n),d=Math.round(l.outerWidth()*n),h=Math.round(l.outerHeight()*n);e=document.createElement("canvas"),e.width=t,e.height=i,e.getContext("2d").drawImage(H,r,c,d,h,0,0,t,i),o.src=e.toDataURL();var a={img:o,left:r,top:c,width:d,height:h,requiredWidth:t,requiredHeight:i};return a},this.position=function(e,t,i,o){$.when(R).done(function(){var n=H.width/u.width();e=Math.round(e/n),t=Math.round(t/n),i=Math.round(i/n),o=Math.round(o/n),l.outerWidth(i).outerHeight(o),l.css({left:e,top:t}),s()})},this.cropReset=function(){z(),s()},$(window).resize(function(){f=H.width/u.width(),p=t/f,w=i/f,z(),s()}),o()};
$('#drop').on('click', function() {
$('#fileUpload').trigger('click');
});
$('#fileUpload').on('change', function(e) {
addImage(e.target);
});
$("#drop").on("dragover", function(e) {
e.preventDefault();
e.stopPropagation();
$(this).addClass('dragging');
});
$("#drop").on("dragleave", function(e) {
$(this).removeClass('dragging');
});
$("#drop").on("drop", function(e) {
e.preventDefault();
e.stopPropagation();
var data = e.dataTransfer || e.originalEvent.dataTransfer;
addImage(data);
});
function addImage(data) {
var file = data.files[0];
if (file.type.indexOf('image') === -1) {
alert('Sorry, the file you uploaded doesn\'t appear to be an image.');
return false;
}
var reader = new FileReader();
reader.onload = function(event) {
var img = new Image();
img.onload = function() {
if (img.width < 200 || img.height < 400) {
alert('Sorry, the image you uploaded doesn\'t appear to be large enough.');
return false;
}
cropImage(img);
}
img.src = event.target.result;
}
reader.readAsDataURL(file);
}
function cropImage(originalImage) {
$(originalImage).attr('id', 'fullImage');
$('#imageResize').html(originalImage);
$('#sectionDragAndDrop').addClass('hidden');
$('#sectionResize').removeClass('hidden');
var newImage = new imageCrop('#fullImage', 480, 800);
$('#crop').on('click', function() {
var results = newImage.crop();
$('#thumbnail').html(results.img);
$('#sectionResize').addClass('hidden');
$('#sectionThumbnail').removeClass('hidden');
});