在 Javascript 中，如何使用“push”函数定位数组条目？

Question

i've been struggling with this, would appreciate help.

i'm looking to update the value of "v.low" to like 6000 (manually) outside of the loop at the last index position in the array (last index = latest timestamp, so its current time). But i can't target the entry properly in the array with JS.

here is an example - but the below is sitting in a loop where "v" is associated to the row in array

  chartList[container]['option'].series[0].data.push([
    v.open,
    v.close,
    v.low,    ----< want to update its value here to 6000
    v.high
  ]);

//i'm trying it this way, but its obviously wrong, want to update low @ last index position

chartList[container]['option'].series[0].data[ arraylength-1 ].low=6000; ----> also tried this: chartList[container]['option'].series[0].data[ arraylength-1 ].push('low',6000);

//i essentially want to update the value of "low" at the last index in array "chartList[container]['option'].series[0].data"

Here is the code

---

// List all data candle
  $.each(dataParsed.candles, function(k, v){ vListChart.push(v.close);   });



  if(jQuery.inArray(dataParsed.candles[dataParsed.candles.length - 1].date, chartList[container]['option'].xAxis[0].data) === -1){

  //  showAlert('we have new data');        

    chartList[container]['option'].series[0].data = chartList[container]['option'].series[0].data.slice(0, -4);
    chartList[container]['option'].series[1].data = chartList[container]['option'].series[1].data.slice(0, -4);
    chartList[container]['option'].xAxis[0].data = chartList[container]['option'].xAxis[0].data.slice(0, -4);

    chartList[container]['data_candles'] = chartList[container]['data_candles'].slice(0, -4);
    chartList[container]['data_candles'] = $.merge(chartList[container]['data_candles'], dataParsed.candles);

    chartList[container]['data'] = chartList[container]['data'].slice(0, -4);
    chartList[container]['data'] = $.merge(chartList[container]['data'], vListChart);

    $.each(dataParsed.candles, function(k, v){
      chartList[container]['option'].xAxis[0].data.push(v.date);
      chartList[container]['option'].series[0].data.push([
        v.open,
        v.close,
        v.low,
        v.high
      ]);

      if(k == dataParsed.candles.length - 1){
        chartList[container]['option'].series[1].data.push(v.open);
      } else {
        chartList[container]['option'].series[1].data.push(v.close);
      }

    });

/// this is the candle formation

echo json_encode([
  'error' => 0,
  'candles' => $listCandles,
  'current_price' => $Coin->_getPrice(),
  'notification_list' => $listNotification,
  'order_list' => $listOrder,
  'internal_order' => $internalOrderList,
  'currency' => $CryptoApi->_getCurrency()
]);

Answer 1

chartList[container]['option'].series[0].data[ arraylength-1 ][2]=6000

请注意，这不会影响 v 引用的对象。