將上傳的文件在本地預覽

將上傳的文件在文本預覽

var reader = new FileReader();
let that = this;
reader.readAsDataURL(file.file);
reader.onload = function(e) {
  that.signFileUrlS = this.result;
  console.log(this);
}

https://blog.csdn.net/MagicWing_zs/article/details/83550273