（三）CodeMirror - Event

"change" (instance: CodeMirror, changeObj: object)

{
    from,         // object
    to,           // object
    text,         // array
    removed,      // string,被删除的字符
    origin
}           

"beforeChange" (instance: CodeMirror, changeObj: object)

 // 如编辑行存在init字符，则取消编辑
 editors.on("beforeChange", function(cm, co) {
     if(cm.doc.children[0].lines[co.from.line].text.indexOf('init')>-1){
         co.cancel();
     }
 });

"keyHandled" (instance: CodeMirror, name: string, event: Event)

当按下扩展快捷键触发

{
    cm,
    name,      // 扩展键名
    event      // keypress或keydown事件对象
}

 editors.on('keyHandled', function(cm,name,e){
     console.log(name);
 });

"renderLine" (instance: CodeMirror, line: LineHandle, element: Element)

 // 代码显示
 editors.on("renderLine", function(cm, line, elt) {
     var off = CodeMirror.countColumn(line.text, null, cm.getOption("tabSize")) * charWidth;
      elt.style.textIndent = "-" + off + "px";
      elt.style.paddingLeft = (basePadding + off) + "px";
 });