手写bind

<script>
    Function.prototype.myBind = function (thisArg, ...args) {
        // 返回一个绑定了this的新函数
        return (...args2) => this.call(thisArg, ...args, ...args2)
    }
 
    const person = {
        name: 'mandy',
        age: 21
    }
 
    function fun(numA, numB, numX, numY) {
        console.log(this);
        console.log(numA, numB, numX, numY);
        return numA + numB + numX + numY;
    }
 
    const funBind = fun.myBind(person, 1, 2)
    const result2 = funBind(3, 4)
    console.log('bind - result:' + result2);
</script>

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