Question

运行以下代码时，为什么会收到此错误消息。

参数列表
之后的
Uncaught SyntaxError：missing）

<html>
    <head>
        <title>read json</title>
        <script type="text/javascript">
    var load = function() {
      var data='{"took": 2,"timed_out": false,"_pieces": {  "total": 5,  "successful": 5,  "failed": 0},"hits": {  "total": 117,  "max_score": 0,  "hits": []},"aggregations": {  "2": {    "doc_error": 228,    "sum_other_t": 10705,    "buckets": [      {        "key": "2016",        "count": 196      },      {        "key": "2015",        "count": 163      },      {        "key": "2014",        "count": 159      },      {        "key": "2013",        "count": 157      },      {        "key": "2012",        "count": 157      }    ]  }}}';
      var myData = JSON.parse(data);
      console.log(myData.aggregations.2.buckets.length) ;   
      //console.log(myData) ;   
    }
</script>
    </head>
    <body>
hi
    </body>
</html>

Answer 1

根据文档 dot notation 只能在

时使用

在此代码中，属性必须是有效的JavaScript标识符，即一系列字母数字字符，也包括下划线（“_”）和美元符号（“$”），它们不能以数字开头。例如，object。$ 1有效，而object.1不是。

因此，您需要使用bracket notation([])访问媒体资源2

<html>

<head>
  <title>read json</title>
  <script type="text/javascript">
    var load = function() {
      var data = '{"took": 2,"timed_out": false,"_pieces": {  "total": 5,  "successful": 5,  "failed": 0},"hits": {  "total": 11537,  "max_score": 0,  "hits": []},"aggregations": {  "2": {    "_upper_bound": 228,    "doc_count": 10705,    "buckets": [      {        "key": "2016",        "count": 196      },      {        "key": "2015",        "count": 163      },      {        "key": "2014",        "count": 159      },      {        "key": "2013",        "count": 157      },      {        "key": "2012",        "count": 157      }    ]  }}}';
      var myData = JSON.parse(data);
      console.log(myData.aggregations[2].buckets.length);
      //console.log(myData) ;   
    }
  </script>
</head>

<body onload="load()">
  hi
</body>

</html>

仅供参考：此外，无需将其定义为JSON字符串，它也是JavaScript中的有效对象格式，您可以将其定义为对象。

<html>

<head>
  <title>read json</title>
  <script type="text/javascript">
    var load = function() {
      var data = {"took": 2,"timed_out": false,"_pieces": {  "total": 5,  "successful": 5,  "failed": 0},"hits": {  "total": 11537,  "max_score": 0,  "hits": []},"aggregations": {  "2": {    "doc_count_error_upper_bound": 228,    "sum_other_doc_count": 10705,    "buckets": [      {        "key": "2016",        "count": 196      },      {        "key": "2015",        "count": 163      },      {        "key": "2014",        "count": 159      },      {        "key": "2013",        "count": 157      },      {        "key": "2012",        "count": 157      }    ]  }}};
      console.log(data.aggregations[2].buckets.length);
      //console.log(myData) ;   
    }
  </script>
</head>

<body onload="load()">
  hi
</body>

</html>

是什么导致“未捕获的SyntaxError：缺失”＆＃39;在这个代码示例中？

1 个答案: