js实现登录框鼠标拖拽效果

效果图：

代码如下：

 
 
 
 body {
  background: url("https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1488778794834&di=e97c96dfe7860297d1968c30adc862a2&imgtype=0&src=http%3A%2F%2Fpic1.5442.com%3A82%2F2015%2F0409%2F01%2F15.jpg%2521960.jpg") no-repeat top center #ffffff;
  background-size: 100%;
  padding: 0;
  margin: 0;
  font-size: 12px;
  font-family: "微软雅黑", sans-serif;
 }
 .ui-dialog {
  width: 380px;
  position: absolute;
  z-index: 9000;
  top: 100px;
  left: 100px;
  border: 1px solid #d5d5d5;
  background-color: #ffffff;
  
 }
 .ui-dialog-title {
  height: 48px;
  line-height: 48px;
  padding-left: 20px;
  color: #535353;
  font-size: 16px;
  background-color: #f5f5f5;
  border-bottom: 1px solid #efefef;
  cursor: move;
 }
 .ui-dialog-title-closebutton {
  width: 16px;
  height: 16px;
  display: inline-block;
  position: absolute;
  right: 20px;
  color: #000;
  text-decoration: unset;
 }
 .ui-dialog-title-closebutton:hover {
  color: #4ca8ff;
 }
 .ui-dialog-content {
  padding: 15px 20px;
 }
 .ui-dialog-pt15 {
  padding-top: 15px;
 }
 .ui-dialog-l40 {
  height: 40px;
  line-height: 40px;
  text-align: right;
 }
 .ui-dialog-input {
  width: 100%;
  height: 40px;
  margin: 0;
  padding: 0;
  border:1px solid #d5d5d5;
  font-size: 16px;
  color: #c1c1c1;
  text-indent: 25px;
  outline: none;
 }
 .ui-dialog-input-username {
  background: url("images/input_username.png") no-repeat 2px;
 }
 .ui-dialog-input-password {
  background: url("images/input_password.png") no-repeat 2px;
 }
 .ui-dialog-submit {
  width: 100%;
  height: 50px;
  background: #3b7ae3;
  border: none;
  font-size: 16px;
  color: #ffffff;
  outline: none;
  text-decoration: none;
  display: block;
  text-align: center;
  line-height: 50px;
 }
 .ui-dialog-submit:hover {
  background: #3f81b0;
 }
 .ui-mask {
  width: 100%;
  height: 100%;
  background: #000;
  opacity: 0.4;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 8000;
  display: none;
 }
 .link {
  text-align: right;
  line-height: 20px;
  padding-right: 40px;
 }
 


 
 
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