预览图片

let upLoadpic=$('#upLoadpic');
const fleReader = new FileReader();
let file=null
upLoadpic.change(()=>{
    file=upLoadpic.prop('files')[0]
    fleReader.readAsDataURL(file)
    fleReader.onload = function(e) {
        console.log(e.target.result);  // 上传的图片的编码
        $pickedPhoto.attr('src',e.target.result)
    }
})