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json=[{"datetime":"1494389400000","tempvalue":"28"},
{"datetime":"1494390000000","tempvalue":"29"},
{"datetime":"1494390600000","tempvalue":"32"},
{"datetime":"1494391200000","tempvalue":"31.5"},
{"datetime":"1494391800000","tempvalue":"29.6"},
{"datetime":"1494392400000","tempvalue":"27.3"}]
data=[[1494389400000,28],
[1494390000000,29],
[1494390600000,32],
[1494391200000,31.5],
[1494391800000,29.6],
[1494392400000,27.3]]
json.map(o => [o.datetime,o.tempvalue])
var data = [];
for(var i in json){
data.push([json[i].datetime,json[i].tempvalue]);
}