javascript - Trying to call a value out of an array that is labeled as a number -

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i had diffrent api before one. when run javascript can array when try append table tells me "uncaught syntaxerror: missing ) after argument list" don't know if because i'm trying call number or because working fine when had name value there. javascript. 

    var bitcoinapiurl = "https://crossorigin.me/http://api.bitcoincharts.com/v1/weighted_prices.json"; $(document).ready(function(){   $(".btn").on("click", function(){     var usercurrency = $('#usercurrency option:selected').text();     $("#div1").append("<p id='currencylabel' />");     $.ajax({       type: "get",       url: bitcoinapiurl,       datatype: "json",       success: function(currency) {         // loop through currency         (var = 0; < currency.length; i++)          {           if(currency[i].usd == usercurrency)           {               var $tr = $("<tr class='hello' />");               $tr.append( $("<td />").text(currency[i]['24h'] ));               $tr.append( $("<td />").text(currency[i].latest_trade || "information unavailable") );               $tr.append( $("<td />").text(currency[i].bid || "information unavailable") );               $tr.append( $("<td />").text(currency[i].high || "information unavailable") );                    $("#thetable tbody").append($tr);             }         }         $("#currencylabel").append(usercurrency);       }       });     });   });

this invalid:

$tr.append( $("<td />").text(currency[i].7d || "information unavailable") );

you can't have currency[i].7d. property name can't start digit. can however:

$tr.append( $("<td />").text(currency[i]['7d'] || "information unavailable") );

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