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javascript繼承(call方法)機(jī)制的兩種實現(xiàn)

內(nèi)部實現(xiàn)：

function ClassA(sColor) {
this.color = sColor
this.sayColor = function () {
    console.log(this.color)
}
}
function ClassB(sName) {
this.name = sName
this.sayName = function () {
    console.log(this.name)
}
}
function ClassC(sColor, sName) {
ClassA.call(this,sColor)
ClassB.call(this,sName)
}
var objA = new ClassA("blue")
var objC = new ClassC("red", "John")
objA.sayColor()
objC.sayColor()
objC.sayName()

外部實現(xiàn)：

function ClassA(sColor) {
this.color = sColor
this.sayColor = function () {
    console.log(this.color)
}
}
function ClassB(sName) {
this.name = sName
this.sayName = function () {
    console.log(this.name)
}
}
function ClassC(sColor, sName) {
}
var objA = new ClassA("blue")
var objC = new ClassC()
ClassA.call(objC,'red')
ClassB.call(objC,'John')
objA.sayColor()
objC.sayColor()
objC.sayName()