npm install editor.md

bower install editor.md

<link rel="stylesheet" href="editor.md/css/editormd.min.css" />
<div id="editor">
    <!-- Tips: Editor.md can auto append a `<textarea>` tag -->
    <textarea style="display:none;">### Hello Editor.md !</textarea>
</div>
<script src="jquery.min.js"></script>
<script src="editor.md/editormd.min.js"></script>
<script type="text/javascript">
    $(function() {
        var editor = editormd("editor", {
            // width: "100%",
            // height: "100%",
            // markdown: "xxxx",     // dynamic set Markdown text
            path : "editor.md/lib/"  // Autoload modules mode, codemirror, marked... dependents libs path
        });
    });
</script>

<link rel="stylesheet" href="editormd/css/editormd.preview.css" />
<div id="test-markdown-view">
    <!-- Server-side output Markdown text -->
    <textarea style="display:none;">### Hello world!</textarea>             
</div>
<script src="jquery.min.js"></script>
<script src="editormd/editormd.js"></script>
<script src="editormd/lib/marked.min.js"></script>
<script src="editormd/lib/prettify.min.js"></script>
<script type="text/javascript">
    $(function() {
	    var testView = editormd.markdownToHTML("test-markdown-view", {
            // markdown : "[TOC]\n### Hello world!\n## Heading 2", // Also, you can dynamic set Markdown text
            // htmlDecode : true,  // Enable / disable HTML tag encode.
            // htmlDecode : "style,script,iframe",  // Note: If enabled, you should filter some dangerous HTML tags for website security.
        });
    });
</script>    

{
    mode                 : "gfm",          // gfm or markdown
    name                 : "",             // Form element name for post
    value                : "",             // value for CodeMirror, if mode not gfm/markdown
    theme                : "",             // Editor.md self themes, before v1.5.0 is CodeMirror theme, default empty
    editorTheme          : "default",      // Editor area, this is CodeMirror theme at v1.5.0
    previewTheme         : "",             // Preview area theme, default empty
    markdown             : "",             // Markdown source code
    appendMarkdown       : "",             // if in init textarea value not empty, append markdown to textarea
    width                : "100%",
    height               : "100%",
    path                 : "./lib/",       // Dependents module file directory
    pluginPath           : "",             // If this empty, default use settings.path + "../plugins/"
    delay                : 300,            // Delay parse markdown to html, Uint : ms
    autoLoadModules      : true,           // Automatic load dependent module files
    watch                : true,
    placeholder          : "Enjoy Markdown! coding now...",
    gotoLine             : true,           // Enable / disable goto a line
    codeFold             : false,
    autoHeight           : false,
    autoFocus            : true,           // Enable / disable auto focus editor left input area
    autoCloseTags        : true,
    searchReplace        : true,           // Enable / disable (CodeMirror) search and replace function
    syncScrolling        : true,           // options: true | false | "single", default true
    readOnly             : false,          // Enable / disable readonly mode
    tabSize              : 4,
    indentUnit           : 4,
    lineNumbers          : true,           // Display editor line numbers
    lineWrapping         : true,
    autoCloseBrackets    : true,
    showTrailingSpace    : true,
    matchBrackets        : true,
    indentWithTabs       : true,
    styleSelectedText    : true,
    matchWordHighlight   : true,           // options: true, false, "onselected"
    styleActiveLine      : true,           // Highlight the current line
    dialogLockScreen     : true,
    dialogShowMask       : true,
    dialogDraggable      : true,
    dialogMaskBgColor    : "#fff",
    dialogMaskOpacity    : 0.1,
    fontSize             : "13px",
    saveHTMLToTextarea   : false,          // If enable, Editor will create a <textarea name="{editor-id}-html-code"> tag save HTML code for form post to server-side.
    disabledKeyMaps      : [],
    
    onload               : function() {},
    onresize             : function() {},
    onchange             : function() {},
    onwatch              : null,
    onunwatch            : null,
    onpreviewing         : function() {},
    onpreviewed          : function() {},
    onfullscreen         : function() {},
    onfullscreenExit     : function() {},
    onscroll             : function() {},
    onpreviewscroll      : function() {},
    
    imageUpload          : false,          // Enable/disable upload
    imageFormats         : ["jpg", "jpeg", "gif", "png", "bmp", "webp"],
    imageUploadURL       : "",             // Upload url
    crossDomainUpload    : false,          // Enable/disable Cross-domain upload
    uploadCallbackURL    : "",             // Cross-domain upload callback url

    toc                  : true,           // Table of contents
    tocm                 : false,          // Using [TOCM], auto create ToC dropdown menu
    tocTitle             : "",             // for ToC dropdown menu button
    tocDropdown          : false,          // Enable/disable Table Of Contents dropdown menu
    tocContainer         : "",             // Custom Table Of Contents Container Selector
    tocStartLevel        : 1,              // Said from H1 to create ToC
    htmlDecode           : false,          // Open the HTML tag identification 
    pageBreak            : true,           // Enable parse page break [========]
    atLink               : true,           // for @link
    emailLink            : true,           // for email address auto link
    taskList             : false,          // Enable Github Flavored Markdown task lists
    emoji                : false,          // :emoji: , Support Github emoji, Twitter Emoji (Twemoji);
                                           // Support FontAwesome icon emoji :fa-xxx: > Using fontAwesome icon web fonts;
                                           // Support Editor.md logo icon emoji :editormd-logo: :editormd-logo-1x: > 1~8x;
    tex                  : false,          // TeX(LaTeX), based on KaTeX
    flowChart            : false,          // flowChart.js only support IE9+
    sequenceDiagram      : false,          // sequenceDiagram.js only support IE9+
    previewCodeHighlight : true,           // Enable / disable code highlight of editor preview area

    toolbar              : true,           // show or hide toolbar
    toolbarAutoFixed     : true,           // on window scroll auto fixed position
    toolbarIcons         : "full",         // Toolbar icons mode, options: full, simple, mini, See `editormd.toolbarModes` property.
    toolbarTitles        : {},
    toolbarHandlers      : {
        ucwords : function() {
            return editormd.toolbarHandlers.ucwords;
        },
        lowercase : function() {
            return editormd.toolbarHandlers.lowercase;
        }
    },
    toolbarCustomIcons   : {               // using html tag create toolbar icon, unused default <a> tag.
        lowercase        : "<a href=\"javascript:;\" title=\"Lowercase\" unselectable=\"on\"><i class=\"fa\" name=\"lowercase\" style=\"font-size:24px;margin-top: -10px;\">a</i></a>",
        "ucwords"        : "<a href=\"javascript:;\" title=\"ucwords\" unselectable=\"on\"><i class=\"fa\" name=\"ucwords\" style=\"font-size:20px;margin-top: -3px;\">Aa</i></a>"
    },
    toolbarIconTexts     : {},
    
    lang : {  // Language data, you can custom your language.
        name        : "zh-cn",
        description : "开源在线Markdown编辑器<br/>Open source online Markdown editor.",
        tocTitle    : "目录",
        toolbar     : {
            //...
        },
        button: {
            //...
        },
        dialog : {
            //...
        }
        //...
    }
}