// 2. 计算前缀和：count[i]表示<=i的元素个数
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完美日记起家于“大牌平替”，从诞生之初就锚定高性价比、入门级、年轻学生党的用户标签。这种定位帮助它快速起量，但也给品牌套上了沉重的枷锁：在用户心智中，完美日记等同于“便宜、基础、平替”，这种认知一旦形成，极难改写。
audioElement.play().catch((e) = {，这一点在WPS下载最新地址中也有详细论述