如何解决TypeError:d3.time是未定义的？

Question

我想用D3.js解析数据/时间.为此我创建了一个javascript文件并使用var d3 = require('d3').我使用安装D3 npm install d3,并尝试将npm install d3 --save其保存在package.json文件中:

{
  "name": "school",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "browserify": "^13.1.0",
    "bufferutil": "^1.2.1",
    "d3": "^4.2.2",
    "express": "^4.14.0",
    "guid": "0.0.12",
    "gulp": "^3.9.1",
    "react": "^15.3.1",
    "react-dom": "^15.3.1",
    "reactify": "^1.1.1",
    "utf-8-validate": "^1.2.1",
    "vinyl-source-stream": "^1.1.0",
    "websocket": "^1.0.23",
    "ws": "^1.1.1"
  }
}

但是,我正面临这个例外:

TypeError: d3.time is undefined

程序代码:

'use strict';

var d3 = require("d3");
var latency_arr = [];
var time_arr = [];
var timeFormat = d3.time.format('%H:%M:%S %L');

module.exports = {
  histogram: function(data) {
    console.log(data);
    return {

      getBin: function() {

        var jsonObject = JSON.parse(data);
        this.time_arr = jsonObject.time;
        for(var i = 0 ; i < this.time_arr.length ; i++){
            temp_time = this.time_arr[i];
            this.time_arr[i] = new Date(timeFormat.parse(temp_time));
        }
        return this.time_arr;
      },

      addValue: function(date, value) {
        return true;
      },

      getValues: function() {
        if(data !== undefined){
            var jsonObject = JSON.parse(data);
            this.latency_arr = jsonObject.latency;
            return this.latency_arr;
        }
      }
    };
  }
};

检查:

> var d3 = require('d3');
undefined

但是d3模块位于node_modules目录中.

为什么不识别d3模块？我错过了什么？

Answer 1

您要求D3 v4.2.2不再具有d3.time属性,这是D3 v3的一部分.根据更改日志,时间格式受一般命名空间扁平化的影响,因此重命名如下:

• d3.time.format↦ d3.timeFormat
• d3.time.format.utc↦ d3.utcFormat
• d3.time.format.iso↦ d3.isoFormat

也就是说,它确实识别了d3对象,而d3.time未定义的对象.将代码更改为

var timeFormat = d3.timeFormat('%H:%M:%S %L');

应该做的伎俩.