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计算机算数误差：
<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进行计算，避免误差,见下方js
<p>
1. 引入math.js 2.配置number bignumbers较慢但精度较高。大数字的计算仅由算术函数支持。3. 执行计算
</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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