现在手机拍照的像素都很高，导致图片很大，再上传多张图片时很容易失败，于是研究下压缩图片，最终解决办法如下
// 先拿到临时路径
chooseSfzImg(e) {
let that = this;
console.log(e);
uni.chooseImage({
count: 1, //默认9
sizeType: ['compressed'],
success: function(res) {
// 压缩
that.getImageInfo(res.tempFilePaths[0]).then(res => {
that.sfzImg = res;
});
}
});
},
// 压缩图片
getImageInfo(src) {
let _this = this;
return new Promise((resolve, reject) => {
uni.showLoading({
title: '压缩中...',
icon: 'none'
});
uni.getImageInfo({
src: src,
success(res) {
console.log('压缩前', res);
let canvasWidth = res.width; //图片原始长宽
let canvasHeight = res.height;
let img = new Image();
img.src = res.path;
let canvas = document.createElement('canvas');
let ctx = canvas.getContext('2d');
canvas.width = canvasWidth / 2;
canvas.height = canvasHeight / 2;
console.log(img);
ctx.drawImage(img, 0, 0, canvasWidth / 2, canvasHeight / 2);
canvas.toBlob(function(fileSrc) {
let imgSrc = window.URL.createObjectURL(fileSrc);
console.log('压缩后', imgSrc);
resolve(imgSrc);
uni.hideLoading();
});
}
});
});
},
