ios兼容

border-radius在ios的兼容：-webkit-appearance:none;  加上这个属性，可以保证安卓和ios的圆角一致

var _this = this;
var target = e.target;
var FileReadered = new FileReader();
var image = new Image();
let img1 = e.target.files[0];
//读取图片数据
FileReadered.readAsDataURL(img1);
//读取后做的操作
FileReadered.onload = function(e){
image.src = e.target.result;
image.onload = function(){
let imgWidth = image.width;
let imgHeight = image.height;
let quality = 0.3;
let canvas = document.createElement("canvas");
let ctx = canvas.getContext("2d");
//压缩开始
if(imgWidth >= imgHeight && imgWidth > 750){
imgWidth = 750;
imgHeight = Math.ceil(750 * this.height / this.width);
}else if(imgWidth < imgHeight && imgHeight > 1334){
imgWidth = Math.ceil(1334 * this.width / this.height);
imgHeight = 1334;
}
canvas.width = imgWidth;
canvas.height = imgHeight;
//画画开始
ctx.drawImage(image, 0, 0, imgWidth, imgHeight);
//把canvas的图片转为url
let cdata = canvas.toDataURL("image/jpeg",quality);
img1= _this.dataURLtoFile(cdata,img1.name);
console.log(img1,‘img111‘)
//上传开始
target.value = ‘‘;
if (!img1.size) {return}
if ( img1.size > 4194304) {
//图片大于4M
this.$vux.toast.text(‘上传头像小于4M‘);
return;
}
let form = new FormData();
form.append(‘file‘,img1);
let config = {
headers:{‘Content-Type‘:‘multipart/form-data‘}
};
_this.$http.post(‘/file/upload?token=‘+localStorage.getItem(‘token‘),form,config).then(res=>{
let arr = ‘userfiles‘+res.data.split(‘userfiles‘)[1];
console.log(arr,‘arr‘)
_this.customer.customerPortrait = arr;
_this.$http.post(‘/customer/update‘,_this.customer).then(ress=>{
if (ress.data.code===0) {
_this.imgAddress = res.data;
console.log(_this.imgAddress,‘this.imgAddress‘)
}
})
})
}
};

import EXIF from ‘exif-js‘ 这个文件是用来做手机拍摄方位的；

EXIF.getData(file, function () {
　　Orientation = EXIF.getTag(this, ‘Orientation‘);   //用变量来接收拍摄方位
});

if (Orientation && Orientation != 1) {
switch (Orientation) {
case 6:
canvas.width = imgHeight;
canvas.height = imgWidth;
ctx.rotate(Math.PI / 2);
ctx.drawImage(image, 0, -imgHeight, imgWidth, imgHeight);
break;
case 3:
ctx.rotate(Math.PI);
ctx.drawImage(image, -imgWidth, -imgHeight, imgWidth, imgHeight);
break;
case 8:
canvas.width = imgHeight;
canvas.height = imgWidth;
ctx.rotate(3 * Math.PI / 2);
ctx.drawImage(image, -imgWidth, 0, imgWidth, imgHeight);
break;
}
} else {
ctx.drawImage(image, 0, 0, imgWidth, imgHeight);
}

最后这段判断是判断图片方位，暂时没有仔细去看；

原文地址：https://www.cnblogs.com/rrene/p/9720417.html