//例1
    <script>
        window.color = \'red\';
        document.color = \'yellow\';

        var s1 = {color: \'blue\' };
        function changeColor(){
            console.log(this.color);
        }

        changeColor.call();         //red (默认传递参数)
        changeColor.call(window);   //red
        changeColor.call(document); //yellow
        changeColor.call(this);     //red
        changeColor.call(s1);       //blue

    </script>

    //例2
    var Pet = {
        words : \'...\',
        speak : function (say) {
            console.log(say + \'\'+ this.words)
        }
    }
    Pet.speak(\'Speak\'); // 结果：Speak...

    var Dog = {
        words:\'Wang\'
    }

    //将this的指向改变成了Dog
    Pet.speak.call(Dog, \'Speak\'); //结果： SpeakWang

 

 

 

    //例1
    <script>
        window.number = \'one\';
        document.number = \'two\';

        var s1 = {number: \'three\' };
        function changeColor(){
            console.log(this.number);
        }

        changeColor.apply();         //one (默认传参)
        changeColor.apply(window);   //one
        changeColor.apply(document); //two
        changeColor.apply(this);     //one
        changeColor.apply(s1);       //three

    </script>

    //例2
    function Pet(words){
        this.words = words;
        this.speak = function () {
            console.log( this.words)
        }
    }
    function Dog(words){
        //Pet.call(this, words); //结果： Wang
       Pet.apply(this, arguments); //结果： Wang
    }
    var dog = new Dog(\'Wang\');
    dog.speak();

https://blog.csdn.net/ganyingxie123456/article/details/70855586

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