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Update upload.js

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This commit is contained in:
邹景立 2022-05-29 20:09:00 +08:00
parent 851c3ff238
commit 82b7079a1e
1 changed files with 19 additions and 18 deletions
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37
app/admin/view/api/upload.js
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@ -253,32 +253,33 @@ define(['md5', 'notify'], function (SparkMD5, Notify, allowMime) {
return reader.readAsDataURL(file), defer.promise();
}
/*! 图片压缩处理 */
function ImageToThumb(url, quality) {
var deferred = jQuery.Deferred();
var maxWidth = 500, maxHeight = 400, image = new Image();
/**
* 图片压缩处理
* @param {String} url
* @param {Object} option
* @constructor
*/
function ImageToThumb(url, option) {
var defer = jQuery.Deferred(), image = new Image();
image.src = url, image.onload = function () {
var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
// 原始尺寸
var originWidth = this.width, originHeight = this.height;
// 目标尺寸
var targetWidth = originWidth, targetHeight = originHeight;
// 图片尺寸超过最大值的限制
if (originWidth > maxWidth || originHeight > maxHeight) {
if (originWidth / originHeight > maxWidth / maxHeight) {
targetWidth = maxWidth;
targetHeight = Math.round(maxWidth * (originHeight / originWidth));
var canvas = document.createElement('canvas'), context = canvas.getContext('2d');
option.maxWidth = option.maxWidth || this.width, option.maxHeight = option.maxHeight || this.height;
var originWidth = this.width, originHeight = this.height, targetWidth = originWidth, targetHeight = originHeight;
if (originWidth > option.maxWidth || originHeight > option.maxHeight) {
if (originWidth / option.maxWidth > option.maxWidth / option.maxHeight) {
targetWidth = option.maxWidth;
targetHeight = Math.round(option.maxWidth * (originHeight / originWidth));
} else {
targetHeight = maxHeight;
targetWidth = Math.round(maxHeight * (originWidth / originHeight));
targetHeight = option.maxHeight;
targetWidth = Math.round(option.maxHeight * (originWidth / originHeight));
}
}
canvas.width = targetWidth, canvas.height = targetHeight;
context.clearRect(0, 0, targetWidth, targetHeight);
context.drawImage(this, 0, 0, targetWidth, targetHeight);
deferred.resolve(canvas.toDataURL('image/jpeg', quality || 0.92));
defer.resolve(canvas.toDataURL('image/jpeg', option.quality || 0.9));
};
return defer.promise();
}
/*! 上传状态提示扩展插件 */