Uncaught Error: cannot call methods on dialog prior to initialization; attempted to call method 'clo

1、错误描述

jquery.min.js:2 Uncaught Error: cannot call methods on dialog prior to initialization; attempted to call method 'close'

angular.min.js:107 Error: cannot call methods on dialog prior to initialization; attempted to call method 'open'

2、错误原因

   var dialog = $( "#dialog" ).dialog({
      resizable: false,
      height: "auto",
       400,
      modal: true,
      buttons: {
        "保存": function() {
          dialog.dialog( "close" );
        },
        "取消": function() {
          $( this ).dialog( "close" );
        }
      }
    });

      在保存按钮函数中，之前用的是$(this).dialog("close");  但是发现点击按钮无效，于是在弹窗前加了var dialog=，然后直接用dialog.dialog("close"); 再次尝试，发现有效果但是会提示错误描述中的错误

3、解决办法

      保证弹窗实例化在前，调用close方法在后