avalonjs implements Weibo-like image dragging effects_javascript skills

Effect:

HTML:

<div id='post_img' ms-controller='post_img'>
   <ul id='post_img_inner' ms-mousemove='onmousemove'>
    <li ms-repeat-el="post_img_list" class='inline-block' ms-mousedown='onmousedown($event,$index,el)' ms-attr-id='post_img_item{{$index}}'>
      <img ms-src='el' class='uploaded_img'></li>
  </ul>
</div>

JS:

var drag_holder=null,index=-1,ori_src=null,drag_flag=false;//拖动的代理，原图片，原图片的src
var post_img = avalon.define('post_img', function(vm) {
  vm.post_img_list=[];//保存所有图片的src
  vm.onmousedown=function(e,i,el){
    $('drag_proxy').style.display='block';
    var target=e.target.parentNode;
    var xx = e.clientX; 
    var yy = e.clientY;
    $('drag_proxy').style.top=yy+'px';
    $('drag_proxy').style.left=xx+'px';
    if(target&&target.nodeName=='LI'){
      ori_src=el;
      index=target.getAttribute('id').substring(13);
      $('drag_proxy').innerHTML=target.innerHTML;
      post_img.post_img_list.splice(i, 1, 'about:blank');
    }
    drag_flag=true;
  }; 
  vm.onmousemove=function(e){
    if(drag_flag){//如果点下了图片
      var xx = e.clientX; 
      var yy = e.clientY; 
      $('drag_proxy').style.top=yy+'px';
      $('drag_proxy').style.left=xx+'px';
      var x=xx-avalon($('post_img')).offset().left;
      var y=yy-avalon($('post_img')).offset().top;
      //例子没有考虑滚动条的情况
      var x_index=Math.floor(x/100);//图片尺寸100*100
      var y_index=Math.floor(y/100);
      post_img.post_img_list.splice(index, 1);//删除当前图片的li
      var target_index=3*y_index+x_index;//目标图片的位置（3*3）
      if(post_img.post_img_list.indexOf('about:blank')!=target_index)
      //如果图片数组中没有src=about:blank这个占位置的li
        post_img.post_img_list.splice(target_index, 0, 'about:blank');
        //添加src=about:blank
      index=target_index;
      //会触发很多次move,所以触发一次就改动一次
    }
  };
});
document.onmouseup=function(e){
  drag_holder=null;
  if(ori_src){
    post_img.post_img_list.splice(index, 1);
    //删除src=about:blank
    post_img.post_img_list.splice(index, 0,ori_src);
    //添加原图片
  }
  $('drag_proxy').style.display='none';
  $('drag_proxy').innerHTML='';
  drag_flag=false;
};

The above is the entire content of this article, I hope you all like it.