code: function filterFullCirleLine(path) {
    Util.each(path, function (subPath, index) {
      var cur = subPath;
      if (cur[0].toLowerCase() === 'a') {
        var pre = path[index - 1];
        var next = path[index + 1];
        if (next && next[0].toLowerCase() === 'a') {
          if (pre && pre[0].toLowerCase() === 'l') {
            pre[0] = 'M';
          }
        } else if (pre && pre[0].toLowerCase() === 'a') {
          if (next && next[0].toLowerCase() === 'l') {
            next[0] = 'M';
          }
        }
      }
    });
  }
docs: 当存在整体的圆时，去除圆前面和后面的线，防止出现直线穿过整个圆的情形