动态地从JSON数组键值对中检索键-Javascript

您是否按照标签所暗示的那样使用D3.js？因为在这种情况下，您可以使用

d3.keys()

var data = [{"A":20,"B":32,"C":27,"D":30,"E":40}];d3.keys(data[0]); // ["A", "B", "C", "D", "E"]

如果您想要所有值的总和，最好使用

d3.values()

d3.sum()

var data = [{"A":20,"B":32,"C":27,"D":30,"E":40}, {"F":50}];// get total of all object totalsvar total = d3.sum(data, function(d) {    // get total of a single object's values    return d3.sum(d3.values(d));});total; // 199