var img = "data:image/jpeg;base64,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";

function dataURLtoFile(dataurl, filename) { //将base64转换为文件  
    var arr = dataurl.split(','), mime = arr[0].match(/:(.*?);/)[1],  
    bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n);  
    while(n--){  
        u8arr[n] = bstr.charCodeAt(n);  
    }  
    return new File([u8arr], filename, {type:mime});  
}

function fileup() {  
    var form=document.forms[0];  
    var formData = new FormData();  
    formData.append("myfile", dataURLtoFile(img,"123.png"));   
    formData.append("name", "123");   
  
    $.ajax({   
     url: 'http://122.112.238.8:8080/api/v1/addface' ,   
     type: 'POST',   
     data: formData,   
     async: false,   
     cache: false,   
     contentType: false,   // 告诉jQuery不要去设置Content-Type请求头  
     processData: false,   // 告诉jQuery不要去处理发送的数据
     success: function (returndata) {   
       console.log(returndata);   
     },   
     error: function (returndata) {   
       alert(returndata);   
     }   
   });