查找以字符串AS3開頭的字符串

Question

我想阻止用戶使用網絡攝像頭模擬器，我通過使用senocular的函數在AS2中完成了這項工作，但是我無法使其在AS3中工作，所以，這裏是old version by senocular，我想在AS3，嘗試使用indexOf，但不起作用，我需要找到至少字符串的前4個字符，並將它們與AS3中的數組內的項目進行比較！

String.prototype.startsWith = function(str){ 
     return !this.indexOf(str); 
    } 

這裏是我想做的事：

var bannedDevices = new Array("FakeCam","SplitCam","Phillips Capture Card 7xx","VLC"); 

var myDeviceName = "SplitCam v1.5"; //"Splitcam" in bannedDevices should trigger this; 

if (myDeviceName.indexOf(bannedDevices)){ 
    trace("banned device"); 
} 

感謝您的幫助！

Answer 1

好的，我留下我以前的答案爲歷史。現在，我知道你想要什麼：

public function FlashTest() { 
    var bannedDevices:Array = new Array("FakeCam","SplitCam","Phillips Capture Card 7xx","VLC"); 

    var myDeviceName:String = "SplitCam v1.5"; //"Splitcam" in bannedDevices should trigger this; 

    trace(startsWith(myDeviceName, bannedDevices, 4)); 
} 

/** 
* @returns An array of strings in pHayStack beginning with pLength first characters of pNeedle 
*/ 
private function startsWith(pNeedle:String, pHayStack:Array, pLength:uint):Array 
{ 
    var result:Array = []; 
    for each (var hay:String in pHayStack) 
    { 
     if (hay.match("^"+pNeedle.substr(0,pLength))) 
     { 
      result.push(hay); 
     } 
    } 
    return result; 
} 

Answer 2

您的需求並不十分清晰...這是一個函數，它返回以給定字符串開頭的數組中的每個字符串。

public function FlashTest() { 
    var hayStack:Array = ["not this one", "still not this one", "ok this one is good", "a trap ok", "okgood too"]; 

    trace(startsWith("ok", hayStack)); 
} 

/** 
* @returns An array of strings in pHayStack beginning with the given string 
*/ 
private function startsWith(pNeedle:String, pHayStack:Array):Array 
{ 
    var result:Array = []; 
    for each (var hay:String in pHayStack) 
    { 
     if (hay.match("^"+pNeedle)) 
     { 
      result.push(hay); 
     } 
    } 
    return result; 
}