JavaScript：splitはIEでは動作しませんか？

Question

IEで次のコードが動作しない理由はありますか？ FFや他の正常なブラウザでは、文字列を指定された式で分割しますが、IEでは単に機能しません。

var str = "abc<font id=\"something\">def</font>gh"; 
alert(str.split(/(\<.*?\>|.)/).length); 

ありがとうございます。

Answer 1

http://msdn.microsoft.com/en-us/library/h6e2eb7w%28VS.85%29.aspxの2番目の例のようにRegExpオブジェクトを使用する必要があります。

よろしくお願いいたします。

Answer 2

下記のコードをプログラムに追加しても問題ありません。

var split; 
// Avoid running twice; that would break the `nativeSplit` reference 
split = split || function (undef) { 

var nativeSplit = String.prototype.split, 
    compliantExecNpcg = /()??/.exec("")[1] === undef, // NPCG: nonparticipating capturing group 
    self; 

self = function (str, separator, limit) { 
    // If `separator` is not a regex, use `nativeSplit` 
    if (Object.prototype.toString.call(separator) !== "[object RegExp]") { 
     return nativeSplit.call(str, separator, limit); 
    } 
    var output = [], 
     flags = (separator.ignoreCase ? "i" : "") + 
       (separator.multiline ? "m" : "") + 
       (separator.extended ? "x" : "") + // Proposed for ES6 
       (separator.sticky  ? "y" : ""), // Firefox 3+ 
     lastLastIndex = 0, 
     // Make `global` and avoid `lastIndex` issues by working with a copy 
     separator = new RegExp(separator.source, flags + "g"), 
     separator2, match, lastIndex, lastLength; 
    str += ""; // Type-convert 
    if (!compliantExecNpcg) { 
     // Doesn't need flags gy, but they don't hurt 
     separator2 = new RegExp("^" + separator.source + "$(?!\\s)", flags); 
    } 
    /* Values for `limit`, per the spec: 
    * If undefined: 4294967295 // Math.pow(2, 32) - 1 
    * If 0, Infinity, or NaN: 0 
    * If positive number: limit = Math.floor(limit); if (limit > 4294967295) limit -= 4294967296; 
    * If negative number: 4294967296 - Math.floor(Math.abs(limit)) 
    * If other: Type-convert, then use the above rules 
    */ 
    limit = limit === undef ? 
     -1 >>> 0 : // Math.pow(2, 32) - 1 
     limit >>> 0; // ToUint32(limit) 
    while (match = separator.exec(str)) { 
     // `separator.lastIndex` is not reliable cross-browser 
     lastIndex = match.index + match[0].length; 
     if (lastIndex > lastLastIndex) { 
      output.push(str.slice(lastLastIndex, match.index)); 
      // Fix browsers whose `exec` methods don't consistently return `undefined` for 
      // nonparticipating capturing groups 
      if (!compliantExecNpcg && match.length > 1) { 
       match[0].replace(separator2, function() { 
        for (var i = 1; i < arguments.length - 2; i++) { 
         if (arguments[i] === undef) { 
          match[i] = undef; 
         } 
        } 
       }); 
      } 
      if (match.length > 1 && match.index < str.length) { 
       Array.prototype.push.apply(output, match.slice(1)); 
      } 
      lastLength = match[0].length; 
      lastLastIndex = lastIndex; 
      if (output.length >= limit) { 
       break; 
      } 
     } 
     if (separator.lastIndex === match.index) { 
      separator.lastIndex++; // Avoid an infinite loop 
     } 
    } 
    if (lastLastIndex === str.length) { 
     if (lastLength || !separator.test("")) { 
      output.push(""); 
     } 
    } else { 
     output.push(str.slice(lastLastIndex)); 
    } 
    return output.length > limit ? output.slice(0, limit) : output; 
}; 

// For convenience 
String.prototype.split = function (separator, limit) { 
    return self(this, separator, limit); 
}; 

return self; 
}();