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这里需要用到jquery Jcrop 插件实现前端选择图片区域效果
然后使用canvas裁剪图片,并把base64位的toDataURL图片转换成blob
最后使用XMLHttpRequest上传到服务器。
预览效果:
整体代码:
- <!doctype html>
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
-
- <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0"/>
- <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
- <meta name="description" id="description1" content="1">
- <meta name="renderer" content="webkit">
- <meta name="format-detection" content="telephone=no">
- <title>图片上传</title>
-
-
- <style type="text/css">
- * {
- box-sizing: border-box; /* h5 */
- -moz-box-sizing: border-box; /* Firefox */
- -webkit-box-sizing: border-box; /* Safari */
- margin: 0;
- padding: 0;
- outline: 0 none;
- font-weight: inherit;
- font-style: inherit;
- font-family: inherit;
- vertical-align: baseline;
- }
- .jcrop-holder {
- direction: ltr;
- text-align: center;
- margin: 0 auto;
- /* IE10 touch compatibility */
- -ms-touch-action: none;
- }
- /* Selection Border */
- .jcrop-vline,
- .jcrop-hline {
- background: #ffffff url("Jcrop.gif");
- font-size: 0;
- position: absolute;
- }
- .jcrop-vline {
- height: 100%;
- width: 1px !important;
- }
- .jcrop-vline.right {
- right: 0;
- }
- .jcrop-hline {
- height: 1px !important;
- width: 100%;
- }
- .jcrop-hline.bottom {
- bottom: 0;
- }
- /* Invisible click targets */
- .jcrop-tracker {
- height: 100%;
- width: 100%;
- /* "turn off" link highlight */
- -webkit-tap-highlight-color: tra

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