mathjs,math.js解決js運算精度問題

時間 2020-12-22

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    <title>Document</title>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/mathjs/5.8.0/math.js"></script>
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<body> 計算機算數偏差： <p>0.1+0.2 = 0.30000000000000004</p>
        <p>17.45*3*0.9 = 47.114999999999995</p>
        <p>17.45*0.9*3 = 47.115</p> 用math進行計算，避免偏差,見下方js <p> 1. 引入math.js 2.配置number BigNumbers較慢但精度較高。大數字的計算僅由算術函數支持。3. 執行計算 </p>
    <script> math.config({number: 'BigNumber'}) console.log(`math--- 0.1+0.2= ${math.eval('0.1+0.2')}`) console.log(`math---17.45*3*0.9 ${math.eval('17.45*3*0.9')}`) console.log(`math---17.45*0.9*3 ${math.eval('17.45*0.9*3')}`) </script>
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