query the btc market percentage from https://coinmarketcap.com/historical
// ==UserScript==
// @id Coinmarketcap_btc_percent
// @name Coinmarketcap中历史比特币占比查看
// @version 0.0.8
// @author Johnathan
// @description query the btc market percentage from https://coinmarketcap.com/historical
// @match http*://coinmarketcap.com/historical/*
// @license MIT
// @namespace https://github.com/dajuguan/Tampermonkey/
// ==/UserScript==
function buildBanner(text) {
const bannerElement = document.createElement('div');
bannerElement.textContent = 'Scroll to show the BTC percentage...'
bannerElement.style = `
color:rgb(255,0,0);
font-size:30px;
background-color: 'orange';
min-height: 40px;
display: block;
justify-content: center;
align-items: center;
position:fixed;
top:30px;
right:80px;
z-index: 2147483647;
`;
return bannerElement;
}
banner = buildBanner()
document.body.prepend(banner)
//window.scrollBy({top:10000,lef:0,behavior:'smooth'});
document.addEventListener("scroll", function (e) {
var tokens = document.querySelectorAll('.cmc-table__cell--sort-by__market-cap>div')
tokens = Array.from(tokens)
var marketcaps = tokens.map((x)=>parseFloat(x.textContent.slice(1).split(',').join('')))
var total = marketcaps.reduce((x,y)=>x+y)
var percentage = (marketcaps[0]/total*100).toFixed(4)
banner.textContent = `total ${marketcaps.length}coins, ${percentage }%`
console.log('total coins:',marketcaps.length)
console.log('BTC marker cap percentage:',percentage)
})