由于对任一数值 x 进行按位非操作的结果为 -(x + 1)。例如，5 结果为 -6，(-1) 结果为 0。
这就可以应用到用 .indexOf 来实现 lodash.contains 的功能:
if (text.indexOf('str') !== -1) {}
//=>
if (!~text.indexOf('str')) {}例子:
参考:
egoist / you-dont-know-es6
《You don't know front-end》series - ECMAScript 2015
12
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