JavaScript数组有长度，但我无法获取值

Question

我正在尝试让我d3 wordcloud做出回应。我已经像这样初始化了云：

var cloud = d3.layout.cloud()
    .rotate(0)
    .font("Open Sans, sans-serif")
    .fontWeight(600)
    .fontSize(d => {
        var size = d.size;
        return size;
    })
    .on("end", (words: any[]) => {
        this.text = this.vis.selectAll("text").data(words); // this.vis is the "g" node appended to the svg
        var b = this.text.enter().append("text");
        b.style("font-size", function (d) { return d.size + "px"; })
            .style("fill", (d: any) => "#272C2F")
            .attr("transform", function (d) {
                return "translate(" + [d.x, d.y] + ")rotate(" + d.rotate + ")";
            })
            .text(function (d) { return d.text; });
    });

当屏幕尺寸发生变化时，我会使用它来更新它：

this.cloud.stop();
this.cloud.size([this.$view.offsetWidth, this.$view.offsetHeight]); // this.$view.offsetWidth and this.$view.offsetWidth call the width and height of the view
this.cloud.words(newlist); // newlist is an array with objects like this { text: string; count: number }

这在第一次运行时效果很好。但它什么也没做。当我查看d3的代码时，我发现它在这个方法中存在问题：

d3_selection_enterPrototype.select = function(selector) {
    var subgroups = [], subgroup, subnode, upgroup, group, node;
    for (var j = -1, m = this.length; ++j < m; ) {
        upgroup = (group = this[j]).update;
        subgroups.push(subgroup = []);
        subgroup.parentNode = group.parentNode;
        for (var i = -1, n = group.length; ++i < n; ) {
            if (node = group[i]) {
                subgroup.push(upgroup[i] = subnode = selector.call(group.parentNode, node.__data__, i, j));
                subnode.__data__ = node.__data__;
            } else {
                subgroup.push(null);
            }
        }
    }
    return d3_selection(subgroups);
};

如果我第一次调用'this'，你可以看到它是一个数组，我可以在数组中调用这些值。然而，当我再次运行它（在调整屏幕大小后）时，值突然消失，即使数组仍具有相同的长度。

这是d3中的错误吗？或者我更新云错了吗？