js获取图形验证码

function ajaxRequest(url, callback, error) {
  $.ajax({
    url: url,
    type: "get",
    dataType: "json",
    contentType: 'application/json',
    success: function(data) {
      if (data.code == 0) {
        callback(data);
      } else {
        console.log(data.msg);
      }
    },
    error: function(data) {
      error(data);
    }
  });
}

getCaptchaToken();
function getCaptchaToken(){
   ajaxRequest(baseUrl+'/h5/captchaToken',function(data){
     var data=data.data; 
     $(".captchaImg").attr('src',baseUrl+'/h5/captcha?captchaToken='+data.captchaToken);  //获取图形验证码
   },function(data){
     console.log(data.msg);
   });
 }
    
<img class="captchaImg" src="" alt="captcha">