JS判断数据类型最稳定方法

Posted 2021-08-20 星云-

JS判断数据类型最稳定的方法

function whatType(input) {
  let typeStr = Object.prototype.toString.call(input).match(/\\[object\\s(.*?)\\]/)
  return typeStr && typeStr[1]
}

console.log(whatType(123))            // Number
console.log(whatType('abc'))          // String
console.log(whatType(false))          // Boolean
console.log(whatType([1,2,3]))        // Array
console.log(whatType({name:'lili'}))  // Object
console.log(whatType(undefined))      // Undefined
console.log(whatType(null))           // Null
console.log(whatType(function(){}))   // Function