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javascriptで前日比のパーセントを表示

Last updated at Posted at 2019-03-12

今日の値と昨日の値の前日比の出し方。

javascript

// 今回は例として、352と350の比較します
var today = 352;
var yesterday = 350;
var result01 = (today - yesterday) / yesterday * 100;
console.log(result01); // 結果 0.5714285714285714

var n = 2 ; // 小数点第n位まで残す
var result02 = Math.floor( result01 * Math.pow( 10, n ) ) / Math.pow( 10, n );
console.log(result02); // 結果 0.57

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