Javascript 空多维数组初始化忽略指针

有没有办法在Javascript中初始化空数组？同样的空数组在php中初始化

$blah = array("0" => "wew", "1" => "fdafa");

foreach ($blah as $blat => $val) {
              $arr[] = $val
              $arr[$blah][] = 1; 
}

或者只是

foreach ($blah as $blat => $val) {
                  $arr[] = $val
    }

---

否，您必须声明

var

并将其初始化为

[]

，然后才能将项目推送到它

var blah = {"0":"wew", "1":"fdafa"}; // an object, not an array

var arr = [];
var obj = {}
for (var blat in blah) {
    var val = blah[blat];
    arr.push(val);
    obj[blat] = 1; 
}

---

您的问题很难理解代码的上下文。你能澄清一下吗？什么是

$arr[$blah][]=1

在PHP中应该做什么，使用关联数组作为键让我感到困惑？