小编Joh*_*ron的帖子

为什么这样做:

a = []
a.push(['test']);
(function() {alert('poop')})()

但这给出了错误"数字不是函数":

a = []
a.push(['test'])
(function() {alert('poop')})()

唯一的区别是第2行末尾的分号.我已经写了很长时间的Javascript.我知道自动分号插入,但我无法弄清楚会导致此错误的原因.

我正在尝试绘制D3.js中客户的平均寿命.我已经绘制了数据,但我无法弄清楚如何绘制显示中位数寿命的参考线.我想要在y轴的50%值处与我的数据相交的垂直和水平参考线.

这是我目前的情况:

垂直参考线需要与水平参考线在相同位置的数据相交.

这是我的代码:

d3.json('data.json', function(billingData) {
    var paying = billingData.paying;
    var w = 800;
    var h = 600;
    var secondsInInterval = 604800000; // Seconds in a week

    var padding = 50;

    var age = function(beginDate, secondsInInterval) {
        // Calculate how old a subscription is given it's begin date

        var diff = new Date() - new Date(beginDate);
        return Math.floor(diff / secondsInInterval);
    }

    var maxAge = d3.max(paying, function(d) { return age(d.subscription.activated_at, secondsInInterval); });

    var breakdown = new Array(maxAge);

    $.each(paying, function(i,d) { …

如果我编写如下所示的 Gateway 和 VirtualService 条目，主机属性匹配什么标准来确定是否应将传入请求路由到服务？它是 HTTP 请求中的“主机”标头，还是其他什么？

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: default-gateway
  namespace: web
spec:
  selector:
    istio: ingressgateway
  servers:
  - hosts:
    - example.com
    port:
      name: www
      number: 80
      protocol: HTTP
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: web
  namespace: web
spec:
  gateways:
  - default-gateway
  hosts:
  - example.com
  http:
  - route:
    - destination:
        host: webserver # assume this is the name of the Service for our deployed container
---
# Assume a Service and Deployment exist for the above …