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数字扩展 - 读书笔记
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<h1>数字扩展</h1>
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<p>Number.isInteger()用来判断一个数值是否为整数。<br/>
如果对数据精度的要求较高，不建议使用Number.isInteger()判断一个数值是否为整数。<br/>
Math.trunc方法用于去除一个数的小数部分，返回整数部分。<br/>
Math.sign方法用来判断一个数到底是正数、负数、还是零。对于非数值，会先将其转换为数值。</p>
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