js 柯里化

function add(a, b) {
    return a + b;
}
function curry(){
    var [...rest1] = arguments;
    return function(){
        var [...rest2] = arguments;
        return that.call(this,rest1.concat(rest2));
    }
}

var add11 = add.curry(1);

console.log(add11(8)); // 9   

参考自：https://segmentfault.com/a/1190000012364000