var json2 =({
  "?xml": {
    "@version": "1.0",
    "@encoding": "UTF-8"
  },
  "text": {
    "heading1": {
      "@fieldnumber": "0",
      "#text": "目的"
    },
    "objective": {
      "@fieldnumber": "1",
      "#text": "理解三角比即为三角形的边的比值。"
    },
    "heading2": {
      "@fieldnumber": "2",
      "#text": "总结"
    },
    "summary": {
      "@fieldnumber": "3",
      "#cdata-section": "&#187;  在直角三角形里，余弦的定义是邻边/斜边\n<br>&#187; 正弦的定义是对边/斜边<br>&#187; 正切的定义是对边/邻边"
    }
  }
});
