將參數傳遞給函數原型

Question

這段代碼是作為先前關於流量控制問題的工作解決方案提供的：

// an object to maintain a list of functions that can be called in sequence
// and to manage a completion count for each one
function Sequencer() {
    this.list = [];
    this.cnt = 0;
}

Sequencer.prototype.add = function(/* list of function references here */) {
    this.list.push.apply(this.list, arguments);
}

Sequencer.prototype.next = function() {
    var fn = this.list.shift();
    if (fn) {
        fn(this);
    }
}

Sequencer.prototype.increment = function(n) {
    n = n || 1;
    this.cnt += n;
}

// when calling .decrement(), if the count gets to zero
// then the next function in the sequence will be called
Sequencer.prototype.decrement = function(n) {
    n = n || 1;
    this.cnt -= n;
    if (this.cnt <= 0) {
        this.cnt = 0;
        this.next();
    }
}

// your actual functions using the sequencer object
function test_1(seq, arg1, arg2, arg3) {
    seq.increment();
        // do something with  arg1, arg2 and arg3
    seq.decrement();
}

function test_2(seq) {
    seq.increment();
        // do something       
    seq.decrement();
}

function test_3(seq) {
    seq.increment();
        // do something       
    seq.decrement();
}

// code to run these in sequence
var s = new Sequencer();

// add all the functions to the sequencer
s.add(test_1, test_2, test_3);

// call the first one to initiate the process
s.next();

將函數添加到s時，如何將參數傳遞給test_1() ？ 例如（這顯然不起作用）：

s.add(test_1(10,'x',true), test_2);

謝謝

Answer 1

如果順序不同，即test_1(arg1, arg2, arg3, seq) ，則可以使用.bind ：

s.add(test_1.bind(null, 10,'x',true) , test_2, test_3);

如果您無法更改順序，請傳遞另一個函數，該函數依次調用test_1 ：

s.add(function(seq) { test_1(seq, 10,'x',true); }, test_2, test_3);

Answer 2

您可以使用Function.arguments訪問函數的給定參數。