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ECharts
数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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异步加载
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异步加载
ECharts
数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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异步加载
ECharts
数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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异步加载
ECharts
数据可视化在过去几年中取得了巨大进展。开发人员对可视化产品的期望不再是简单的图表创建工具,而是在交互、性能、数据处理等方面有更高的要求。
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当我们尝试用JavaScipt测网速 - 爱码网
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事情是这样的,最近尝试写一个通过判断当前网速,从而在前端控制范围请求去分步请求一个大型文件的库。这个东东我现在一行代码都还没写,除了突然发现这个需求的思路有些不太实际之外,另一个原因是我突然问自己——
前端判断网速的原理总结
1.通过img加载或者发起Ajax请求计算网速
通过请求一个和服务端同域的文件,例如图片等,在前端开始请求和收到响应两个时间点分别通过Date.now标记start和end,因为Date.now得出的是1970年1月1日(UTC)到当前时间经过的毫秒数,所以我们通过end - start求出时间差(ms),然后通过计算:
文件大小(KB) * 1000 /( end -start )
就可以计算出网速了(KB/S)。
而请求文件又有两种方法:通过img加载或者AJAX加载:
-
通过创建img对象,设置onload监听回调,然后指定src, 一旦指定src,图片资源就会加载,完成时onload回调就会调用,我们可以根据时机分别标记start和end。
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通过AJAX进行请求,即创建XHR对象,在onreadystatechange回调里,判断当readystate = 4时候加载完成,根据时机分别标记start和end。
2.window.navigator.connection.downlink 网速查询
我们还可以通过一些H5的先进API去实现,例如这里我们可以使用的是window.navigator.connection.downlink 去查询,但是正如你所知道的是,这类API都是一副德性,即老生常谈的兼容性问题,所以我们一般都是作为一种预备的手段,通过能力检测,能用就用它,不能用就通过别的方法。而且需要注意downlink的单位是mbps,转化成KB/S的公式是
navigator.connection.downlink * 1024 / 8
乘1024可以理解,为什么后面要除8呢?这是因为mbps里的b指的是bit(比特),KB/s里面的B指的是Byte(字节),1字节(b)=8比特(bit),所以需要除个8
3. 一般来说,通过请求文件测算网速,单次可能会有误差,所以我们可以请求多次并计算均值。
前端判断网速的方法及其优缺点
-
img加载测速:借助img对象加载测算网速。优点:没有跨域带来的问题。缺点:(1)要自己测文件大小并提供参数fileSize,(2)文件必须为图片 (3)文件大小不能灵活控制
-
Ajax测速: 通过Ajax测算网速。 优点: (1)不用提供文件大小参数,因为可以从response首部获得(2)测试的文件不一定要是图片,且数据量能灵活控制。缺点:跨域问题
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downlink测速: 通过navigator.connection.downlink读取网速。优点:不需要任何参数。缺点:1.兼容性很有问题,2.带宽查询不是实时的,具有分钟级别的时间间隔
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综合实现:先尝试采用downlink测速,否则多次AJAX测速并求平均值
img加载测速
function getSpeedWithImg(imgUrl, fileSize) {
return new Promise((resolve, reject) => {
let start = null;
let end = null;
let img = document.createElement('img');
start = new Date().getTime();
img.onload = function (e) {
end = new Date().getTime();
const speed = fileSize * 1000 / (end - start)
resolve(speed);
}
img.src = imgUrl;
}).catch(err => { throw err });
}
Ajax测速
function getSpeedWithAjax(url) {
return new Promise((resolve, reject) => {
let start = null;
let end = null;
start = new Date().getTime();
const xhr = new XMLHttpRequest();
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
end = new Date().getTime();
const size = xhr.getResponseHeader('Content-Length') / 1024;
const speed = size * 1000 / (end - start)
resolve(speed);
}
}
xhr.open('GET', url);
xhr.send();
}).catch(err => { throw err });
}
downlink测速
function getSpeedWithDnlink() {
// downlink测算网速
const connection = window.navigator.connection;
if (connection && connection.downlink) {
return connection.downlink * 1024 / 8;
}
}
综合测速
function getNetSpeed(url, times) {
// downlink测算网速
const connection = window.navigator.connection;
if (connection && connection.downlink) {
return connection.downlink * 1024 / 8;
}
// 多次测速求平均值
const arr = [];
for (let i = 0; i < times; i++) {
arr.push(getSpeedWithAjax(url));
}
return Promise.all(arr).then(speeds => {
let sum = 0;
speeds.forEach(speed => {
sum += speed;
});
return sum / times;
})
}
import * from 'network-speed-test';
getSpeedWithImg("https://s2.ax1x.com/2019/08/13/mPJ2iq.jpg", 8.97).then(
speed => {
console.log(speed);
}
)
getSpeedWithAjax('./speed.jpg').then(speed => {
console.log(speed);
});
getNetSpeed('./speed.jpg', 3).then(speed => {
console.log(speed);
});
getSpeedWithDnlink();
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