beforeImgUpload(file) {
let reader = new FileReader();
reader.onload = function (e) {
let txt = e.target.result
let img = document.createElement("img")
img.src = txt
img.onload = function () {
console.log("宽度：",img.width);
console.log("高度：",img.height);
}
};
reader.readAsDataURL(file);
},
下面是别人写的一段代码，对图片进行校验的
beforeAvatarUpload(file) {
// 上传图片前处理函数
const isJPG =
file.type === "image/jpeg" ||
file.type === "image/png" ||
file.type === "image/gif";
const isLt2M = file.size / 1024 / 1024 < 2;
let that = this;
let isAllow = false;
if (!isJPG) {
this.$message.error("上传头像图片只能是 jpg、png、gif 格式!");
}
if (!isLt2M) {
this.$message.error("上传头像图片大小不能超过 2MB!");
}
const isSize = new Promise(function(resolve, reject) {
let width = 750;
let height = 420;
let _URL = window.URL || window.webkitURL;
let image = new Image();
image.onload = function() {
let valid = image.width == width && image.height == height;
valid ? resolve() : reject();
};
image.src = _URL.createObjectURL(file);
}).then(
() => {
return file;
},
() => {
this.$message.error("上传头像图片尺寸不符合,只能是750*420!");
return Promise.reject();
}
);
return isJPG && isLt2M && isSize;
}
