其他值到Boolean值的转化规则
在js中存在的假值为:undefined, null, +0, -0, NaN, false, ""(空串)console.log(Boolean(undefined)) //falseconsole.log(Boolean(null)) //falseconsole.log(Boolean(+0)) //falseconsole.log(Boolean(-0)) //falseconsole.log(Boolean(Na
