input如何上传文件

1）绑定input[type=‘file’]的change事件

<input @change="uploadPhoto($event)" type="file" class="kyc-passin">

2）利用fileReader对象获取图片或者文件的base64 编码

checkImg (size, type) {
let checkSuccess = true
// 只支持这三种格式的图片
const supportTypeList = ['image/png', 'image/jpg', 'image/jpeg']
// 图片大小不超过5M
const limitSize = 1024 * 1024 * 5 // 5M
if (!supportTypeList.includes(type)) {
this.changeErrorLayerShow(true)
this.dialogInfo = dialogDescList.formatError
checkSuccess = false
}
if (size > limitSize) {
this.changeErrorLayerShow(true)
this.dialogInfo = dialogDescList.sizeTooBig
checkSuccess = false
}
return checkSuccess
},
uploadPhoto (e, id) {
const uploadImgFiles = e.target.files
const curImgFile = uploadImgFiles[0]
const checkSuccess = this.checkImg(curImgFile.size, curImgFile.type)
if (checkSuccess) {
let reader = new FileReader()
reader.readAsDataURL(curImgFile)
reader.onload = (e) => {
this.uploadCard[id] = e.target.result // base64
}
}
// 处理连续选择相同文件，第二次选文件不会触发change事件
e.target.value = ''
}


3）再利用ajax将获取到的图片或文件的编码传给后台即可。