Pass unknown number of parameters to JS function

2018-06-05 17:24:17

This question already has an answer here:

What is the difference between call and apply? 19 answers

What you want is probably Function.prototype.apply() .

Usage:

var params = [param1, param2, param3];
functiona.apply(this, params);

As others noted, functiona declaration may use arguments , eg:

function functiona()
{
    var param1 = this.arguments[0];
    var param2 = this.arguments[1];
}

But it can use any number of normal parameters as well:

function foo(x, y)
{
    console.log(x);
}
foo.apply(this, [10, 0, null]); // outputs 10

Use arguments :

The arguments object is an Array-like object corresponding to the arguments passed to a function.

是的，所有传递给JavaScript函数的parameters都可以使用函数中的parameters数组访问。

function foo () {
    console.log(arguments[0]); // -> bar
    console.log(arguments[1]); // -> baz
}

foo('bar', 'baz');

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