Question

鉴于这些csv和year，我将搜索suicide_no文件中涉及自杀的数据。我想总结一下每年自杀的总数。我有以下代码：

d3.csv("master.csv", function(error,data){
    if(error) console.log("Erro no ficheiro csv");

    var years = [];
    var suicides = [];

    var taxaAno = new Object();
    var taxaAno = {};

    data.forEach(function(d){
        years = +d.year;
        suicides = +d.suicides_no;


        if (taxaAno==null){
            taxaAno[years]= suicides;
        }
        else{
            taxaAno[years]+= suicides;
        }            


    });

    console.log(taxaAno);
});

我希望字典最后出现。但它看起来像这样：

 {1985: NaN, 1986: NaN, 1987: NaN, 1988: NaN, 1989: NaN, 1990: NaN, 1991: NaN, 1992: NaN, 1993: NaN, 1994: NaN, 1995: NaN, 1996: NaN, 1997: NaN, 1998: NaN, 1999: NaN, 2000: NaN, 2001: NaN, 2002: NaN, 2003: NaN, 2004: NaN, 2005: NaN, 2006: NaN, 2007: NaN, 2008: NaN, 2009: NaN, 2010: NaN, 2011: NaN, 2012: NaN, 2013: NaN, 2014: NaN, 2015: NaN, 2016: NaN}

Answer 1

您正在检查taxaAno是null/undefined而不是taxaAno[years]。这意味着您总是会碰到这一行：

taxaAno[years]+= suicides;

因此，这是您第一次在suicides上添加数字（undefined）。应该是：

   if (taxaAno[years] == null){
        taxaAno[years] = suicides;
   } else {
        taxaAno[years]+= suicides;
   }

在控制台中使用javaScript进行字典打印

1 个答案: