JavaScript:拆分在 IE 中不起作用? [英] JavaScript: split doesn't work in IE?

问题描述

以下代码在 IE 中不起作用有什么原因吗?虽然使用 FF 和其他正常的浏览器，它会根据给定的表达式拆分字符串，但在 IE 中它根本不起作用.

Is there a reason why the following piece of code doesn't work in IE? While with FF and other sane browsers it splits the string by the given expression, in IE it simply doesn't work.

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

谢谢.

推荐答案

你可以将下面的代码添加到你的程序中，它就会起作用.

you could add the code below to you program and it will work.

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;
}();

这篇关于JavaScript:拆分在 IE 中不起作用?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！