layui 复选框限制选择个数的方法

//监听复选框，只能选择3个
form.on('checkbox(pro)',function(obj){  
  var len=$("input[name="problem"]:checked").length;
  if(len>3){
    $(obj.elem).next().attr("class","layui-unselect layui-form-checkbox");
    $(obj.elem).prop("checked",false);
    layer.msg('最多只能选3项！',{icon:5});
    return false;
  }
});

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参考：

https://www.jb51.net/article/170296.htmhttps://www.jb51.net/article/170296.htm