判断是否为对象typeof abc == 'object' 与 instanceof 性能比较

var testTypeof = function(abc) {
    if (typeof abc === 'object') {
       	abc = 0
    }
}

var testEqual = function(abc) {
    if (abc instanceof Object) {
        abc = 0
    }
}

var object = function ABC() {}
var count = 1000000

var date = Date.now()
for (var i = 0; i < count; i++) {
    testTypeof()
}
console.log(Date.now() - date)

var date = Date.now()
for (var i = 0; i < count; i++) {
    testEqual()
}

console.log(Date.now() - date)

$ node test.js
95
7

Date instanceof Object
> true

typeof Date
> "function"