moment.js 算当天时间差

要计算当天时间差，可以使用Moment.js库中的`moment().startOf('day')`方法。这个方法可以将当前时间设为当天的开始时间，然后再用`moment().diff(moment().startOf('day'), 'milliseconds')`方法计算当前时间和当天开始时间的时间差，单位为毫秒。这样就可以得到当天的时间差了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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