CodeMirror 一些簡單配置

editor = CodeMirror.fromTextArea(document.getElementById("textarea"), {
            extraKeys: {                    //  配置按鍵
                "Ctrl": "autocomplete",  // 需要下面的synonyms配置
            },
            lineNumbers: true,              // 顯示行號
            lineWrapping: true,             // 自動換行
            styleActiveLine: true,          // 選中行高亮
            mode: "text/javascript",
            theme: "idea",                  // 主題配置
            matchBrackets: true,            // 匹配括號
            hintOptions: {hint: synonyms},  // 自動提示配置
            gutters: ["CodeMirror-lint-markers"],
            lint: true,                     // 代碼出錯提醒
            indentUnit: 4,                  // 縮進配置（默認為2）
        });
        
        // 自動提示需要支持Pormise， 當當前數據的字符串滿足comp中的某一個word時，會提示該word所在數組的詞匯
        if (typeof Promise !== "undefined") {
            comp = [
			    ["here", "hither"],
			    ["asynchronous", "nonsynchronous"],
			    ["completion", "achievement", "conclusion", "culmination", "expirations"],
			    ["hinting", "advive", "broach", "imply"],
			    ["function","action"],
			    ["provide", "add", "bring", "give"],
			    ["synonyms", "equivalents"],
			    ["words", "token"],
			    ["each", "every"],
			  ];
        }
        
       // 提示功能的代碼， 可以適當修改來滿足自己的需求
	  function synonyms(cm, option) {
		  return new Promise(function(accept) {
		       setTimeout(function() {
		       var cursor = cm.getCursor(), line = cm.getLine(cursor.line)
		       var start = cursor.ch, end = cursor.ch
		       while (start && /\w/.test(line.charAt(start - 1))) --start
		       while (end < line.length && /\w/.test(line.charAt(end))) ++end
		       var word = line.slice(start, end)
		       for (var i = 0; i < comp.length; i++) if (comp[i].indexOf(word) != -1)
		         return accept({list: comp[i],
		                        from: CodeMirror.Pos(cursor.line, start),
		                        to: CodeMirror.Pos(cursor.line, end)})
		       return accept(null)
		     }, 10)
		   })
		 }
		// 額外配置快捷鍵
		editor.addKeyMap({
            'Ctrl-S': function () {
                saveFunction();
            },
            'Ctrl-s': function () {
                saveFunction();
            },
            'Ctrl-f': autoFormatSelection,
        });

		//  自動格式化編輯器
        function autoFormatSelection() {
	        CodeMirror.commands["selectAll"](editor);
	        var range = getSelectedRange();
	        editor.autoFormatRange(range.from, range.to);
	        editor.commentRange(false, range.from, range.to);
	    }
	    // 獲取編輯器中選中范圍的的行號
	    function getSelectedRange() {
	        return {
	            from: editor.getCursor(true),
	            to: editor.getCursor(false)
	        }
	    }
       
        editor.replaceSelection("內容");   // 替換選中的字符串、在光標處插入字符
        editor.setSize('100%', '100%');     //設置代碼框的長寬
        CodeMirror.commands["selectAll"](editor);    // 執行內置的命令
        CodeMirror.commands["goDocEnd"](editor)  //移動到文件尾部
		editor.refresh();   	    // 插件不顯示文本內容，直到點擊才出現