why Undefined problem in alertbox javascript occur when i click
I am trying this code and i also try other method but still this problem occur so remember vs code is my editor.
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//这里可以选择自己需要的工具按钮名称,此处仅选择如下五个
toolbars:[['source','fullscreen', '|', 'undo', 'redo', '|', 'bold', 'italic', 'underline', 'fontborder', 'strikethrough', 'removeformat', 'formatmatch', 'autotypeset', 'blockquote', 'pasteplain', '|', 'forecolor', 'backcolor', 'insertorderedlist', 'insertunorderedlist', 'selectall', 'cleardoc', '|', 'rowspacingtop', 'rowspacingbottom', 'lineheight', '|', 'customstyle', 'paragraph', 'fontfamily', 'fontsize', '|', 'indent', '|', 'justifyleft', 'justifycenter', 'justifyright', 'justifyjustify', '|', 'link', 'unlink', 'anchor', '|', 'simpleupload', 'insertimage', 'scrawl', 'insertvideo', 'attachment', 'map', 'insertcode', '|', 'horizontal', '|', 'preview', 'searchreplace', 'drafts']],
initialContent:'',
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wordCount:false,
zIndex:2,
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elementPathEnabled:false,
//默认的编辑区域高度
initialFrameHeight:250
//更多其他参数，请参考ueditor.config.js中的配置项
//更多其他参数，请参考ueditor.config.js中的配置项
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