外观
判断是否为null或者undefined
null
undefined
uni.$c.isNullish(value)
console.log(uni.$c.isNullish(null)) // true console.log(uni.$c.isNullish('')) // false console.log(uni.$c.isNullish({})) // false console.log(uni.$c.isNullish(0)) // false console.log(uni.$c.isNullish([])) // false