Question

我有一个由Apache Flink Tool编写的文本文件。 1.我想提取这个文件的内容，直到它遇到第999个＆＃34;}，＆＃34; 2.删除最后一个逗号（，） 3.添加＆＃34; [＆＃34;和＆＃34;]＆＃34;在阅读内容的开头和结尾。 4.将此修改后的内容写入变量。

所有这些都要写入变量。

通过Javascript可以实现整个操作吗？

此操作的目的是使其类似于用于绘制Highcharts的JSON数组，一次只能加载1000个点。

fxt文件的内容Flink正在写入：

{"temperSensorData":"28.489084691371996","temperSensorUnit":"celsius","timestamp":"1493270171424","timestamp2":"1493270171454","timestamp3":"1493270171454"},
{"temperSensorData":"28.48908469137112","temperSensorUnit":"celsius","timestamp":"1493270171426","timestamp2":"1493270171522","timestamp3":"1493270171523"},
{"temperSensorData":"28.489084691371186","temperSensorUnit":"celsius","timestamp":"1493270171426","timestamp2":"1493270171523","timestamp3":"1493270171524"},
{"temperSensorData":"28.489084691371595","temperSensorUnit":"celsius","timestamp":"1493270171426","timestamp2":"1493270171524","timestamp3":"1493270171525"},
{"temperSensorData":"28.48908469137168","temperSensorUnit":"celsius","timestamp":"1493270171428","timestamp2":"1493270171529","timestamp3":"1493270171529"},
{"temperSensorData":"28.489084691371684","temperSensorUnit":"celsius","timestamp":"1493270171428","timestamp2":"1493270171529","timestamp3":"1493270171529"},

执行上述所有操作后要写入内容的（JSON）格式：

[
    {
        "temperSensorData": "28.489084691371996",
        "temperSensorUnit": "celsius",
        "timestamp": "1493270171424",
        "timestamp2": "1493270171454",
        "timestamp3": "1493270171454"
    },
    {
        "temperSensorData": "28.48908469137112",
        "temperSensorUnit": "celsius",
        "timestamp": "1493270171426",
        "timestamp2": "1493270171522",
        "timestamp3": "1493270171523"
    },
    {
        "temperSensorData": "28.489084691371186",
        "temperSensorUnit": "celsius",
        "timestamp": "1493270171426",
        "timestamp2": "1493270171523",
        "timestamp3": "1493270171524"
    }
]

Answer 1

如何，这将返回一个如下所示的数组：

[
    [
        {999 ENTRIES}
    ],
    [
        {999 MORE ENTRIES}
    ]
    ...
]

＆＃13;

var input = '{"temperSensorData":"28.489084691371996","temperSensorUnit":"celsius","timestamp":"1493270171424","timestamp2":"1493270171454","timestamp3":"1493270171454"}\n{"temperSensorData":"28.48908469137112","temperSensorUnit":"celsius","timestamp":"1493270171426","timestamp2":"1493270171522","timestamp3":"1493270171523"}\n{"temperSensorData":"28.489084691371186","temperSensorUnit":"celsius","timestamp":"1493270171426","timestamp2":"1493270171523","timestamp3":"1493270171524"}\n{"temperSensorData":"28.489084691371595","temperSensorUnit":"celsius","timestamp":"1493270171426","timestamp2":"1493270171524","timestamp3":"1493270171525"}\n{"temperSensorData":"28.48908469137168","temperSensorUnit":"celsius","timestamp":"1493270171428","timestamp2":"1493270171529","timestamp3":"1493270171529"}\n{"temperSensorData":"28.489084691371684","temperSensorUnit":"celsius","timestamp":"1493270171428","timestamp2":"1493270171529","timestamp3":"1493270171529"}'

splitInput = input.split('\n')
output = splitInput.map((item) => {
  return JSON.parse(item)
})

splitOutput = []

var chunk = 999;
for (var i=0,j=output.length; i<j; i+=chunk) {
    splitOutput.push(output.slice(i,i+chunk))
}

console.log(splitOutput)

＆＃13;

＆＃39;如何阅读文件内容直到＆＃39; n＆＃39;出现一个字符并使用javascript将其写入变量＆＃34;？

1 个答案: