直接上代码
<input value="上传" ref="file" type="file" multiple @change="getFiles">
这里要注意的是上传代码的操作要在Image实例的onload方法中,并且是在canvas转化过后获取到canvas新图片之后。
在Image实例的onload之外是获取不到canvas的打印出来的是null,我将转化后的base64赋值给vue的data数据中也获取不到
getFiles () {
var that = this
var img = new Image()
//获取原图的base64
var reader = new FileReader()
reader.onload = function(e) {
img.src = e.target.result
}
reader.readAsDataURL(that.$refs.file.files[0])
img.onload = function() {
// 当图片宽度超过 700px 时, 就压缩成 700px, 高度按比例计算 // 压缩质量可以根据实际情况调整
var w = Math.min(700, img.width);
var h = img.height * (w / img.width);
var canvas = document.createElement('canvas')
var ctx = canvas.getContext('2d')
canvas.width = w
canvas.height = h
ctx.drawImage(img, 0, 0, w, h)
that.url = canvas.toDataURL('image/png',1)//将canvas转成base64第二个参数是设置质量(越大越好最大1)
var FormDataImg = new FormData()
FormDataImg.append('file', that.$refs.file.files[0])//原图上传
FormDataImg.append('base64', that.url)
that.$toast.loading({
duration: 0,
message: '上传中...',
loadingType: 'spinner'
})
axios({
url: 'http://192.168.0.175:3030/test/uploadFile',
method: 'post',
data: FormDataImg,
header: {'Content-Type': 'multipart/form-data'}
}).then(res => {
that.$toast.clear()
that.$toast('上传成功')
that.imgurl = res.data.data1
}).catch(err => {
that.$toast.clear()
that.$toast('上传错误')
})
}
console.log(this.url)
}