code: function (aNode, sourceBuffer) {
          if (aNode.textExpr.original) {
              sourceBuffer.joinString(serializeStump('text'));
          }
  
          if (aNode.textExpr.value != null) {
              sourceBuffer.joinString(aNode.textExpr.segs[0].literal);
          }
          else {
              sourceBuffer.joinExpr(aNode.textExpr);
          }
  
          if (aNode.textExpr.original) {
              sourceBuffer.joinString(serializeStumpEnd('text'));
          }
      }
docs: 编译文本节点
  
  @param {ANode} aNode 节点对象
  @param {CompileSourceBuffer} sourceBuffer 编译源码的中间buffer