处理回车提交、ctrl+enter和shift+enter都不提交->textarea正常换行

<input type="textarea" @on-keypress="handlerMultiEnter">

　　

handlerMultiEnter(e) {
      let code = e.keyCode;
      let ctrl = e.ctrlKey;
      let shift = e.shiftKey;
      let alt = e.altKey;
      if(code == '10' && ctrl && !shift && !alt) {
        //ctrl + enter
        // return;
      }
      if(code == '13' && !ctrl && shift && !alt) {
        //shift + enter
        // return;
      }
      if(code == '13' && !ctrl && !shift && !alt) {
        //只按了enter
        this.handleSubmit('formValidate');
      }
    },