HTML5实现头像的上传

这是利用form-data给后台传输数据，来实现头像的上传加载！

1. html代码

    
    
    
    
    

    
        
        
        
        
        
        
        
        
        
       
        
             
    
    
        
显示区域
    
    

2. 样式代码

 .container{
            box-sizing: border-box;
            width: 404px;
            height: 100px;
            border: 1px solid #ccc;
            border-radius: 5px;
            padding-top: 20px;
            background: linear-gradient(to bottom,#0ff,#0ff 20px,transparent 0);
            margin: 0 auto;
        }
        input{
            padding: 0;
            margin: 0;
          
        }
        .container input[type=file]{
            width: 300px;
            height: 30px;
            border: 1px solid #ccc;
            background: #7FFFD4;
            color: #133131;
            float: left;
        }
        .container input[typr=button]{
            width: 100px;
            height: 32px;
            float: left;
            border: 1px solid #ccc;
            color:  #133131;
        }
        progress{
            display: none;
            width: 400px;
            height: 30px;
            margin-top: 7px;
        }
        .showarea{
            width: 600px;
            min-height: 200px;
            border: 1px solid #ccc;
            margin: 30px auto;
        }
        .showarea h3{
            widows: 100px;
            margin: 0 auto;
            line-height: 60px;
            text-align: center;
            border-bottom: 1px solid #cccc;
            color: #133131;
            
        }
        .showareaimg{
            max-width: 1000%;
        }

3. javescript代码

  var file = document.querySelector('[type=file]');
        var sub = document.querySelector('[type=button]');
        var show = document.querySelector('.showarea');
        var progress = document.querySelector('progress');
        var Susername = document.getElementById('Susername');
        var Ssex = document.getElementById('Ssex');
        var Sage = document.getElementById('Sage');
        var Smajor = document.getElementById('Smajor');
        var Sschool = document.getElementById('Sschool');
        var Sqq = document.getElementById('Sqq');
        var Saddress = document.getElementById('Saddress');
        var Smotto = document.getElementById('Smotto');
        
        sub.onclick = function(e){
            var fileobje = file.files[0];
            var formdata = new FormData();
            formdata.append('upload',fileobje);
            formdata.append('upload',Susername.value);
            formdata.append('upload',Ssex.value);
            formdata.append('upload',Sage.value);
            formdata.append('upload',Smajor.value);
            formdata.append('upload',Sschool.value);
            formdata.append('upload',Sqq.value);
            formdata.append('upload',Saddress.value);
            formdata.append('upload',Smotto.value);
            var xhr = new XMLHttpRequest();
            var fr = new FileReader();
            fr.readAsDataURL(fileobje)
            fr.onload=function(e){
                // console.log(e);
                var img = document.createElement('img');
                img.src = this.result;
                // console.log( img.src);
                show.appendChild(img)
            }
            xhr.upload.onprogress = function(e){
                progress.value= parseInt(e.loaded/e.total*100)
            }
          xhr.open("POST","http://127.0.0.1:3000/avatar")
        //   console.log(formdata)
          xhr.send(formdata);
          console.log(formdata)
        console.log(formdata.getAll("upload"))
        }