ScriptEngine JavaScript不'；t支持包括？

我有如下代码

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("nashorn");
engine.eval("[1, 2, 3].includes(1)");

但这会引发以下错误

javax.script.ScriptException: TypeError: [1, 2, 3].includes is not a function in <eval> at line number 1
    at jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException(NashornScriptEngine.java:470)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:454)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:406)
    at jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl(NashornScriptEngine.java:402)
    at jdk.nashorn.api.scripting.NashornScriptEngine.eval(NashornScriptEngine.java:155)
    at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:264)

javax.script.ScriptException:TypeError:[1,2,3]。includes不是第1行的函数
位于jdk.nashorn.api.scripting.NashornScriptEngine.throwAsScriptException（NashornScriptEngine.java:470）
位于jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl（NashornScriptEngine.java:454）
位于jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl（NashornScriptEngine.java:406）
位于jdk.nashorn.api.scripting.NashornScriptEngine.evalImpl（NashornScriptEngine.java:402）
位于jdk.nashorn.api.scripting.NashornScriptEngine.eval（NashornScriptEngine.java:155）
位于javax.script.AbstractScriptEngine.eval（AbstractScriptEngine.java:264）

---

我可以改为使用indexOf（1），这似乎是可行的，但是有没有理由我不能使用这个解析器访问includes？

String.prototype.includes在ECMAScript 2015（ECMA-262第6版）中指定。Nashorn引擎实现ECMA-262版本5.1）。另见

---

具有String.prototype.includes的polyfill。我检查了polyfill是否与Nashorn引擎一起工作。

Nashorn不支持includes（），因为它在添加includes（）之前实现了早期版本的JavaScript规范。您可以使用Mozilla网站上的参考资料，将对includes（）的polyfill（也称为shim）支持添加到Nashorn中

• 字符串包含（）多边形填充：
• 数组包含（）多边形填充：

最初的问题是在JavaScript数组上执行includes（）。之前的答案是针对JavaScript字符串的，因此不正确。下面是一段JUnit测试代码，展示了如何对数组和字符串使用polyfills

    // Copied from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes#Polyfill
    public static final String NASHORN_POLYFILL_STRING_PROTOTYPE_INCLUDES = "if (!String.prototype.includes) { Object.defineProperty(String.prototype, 'includes', { value: function(search, start) { if (typeof start !== 'number') { start = 0 } if (start + search.length > this.length) { return false } else { return this.indexOf(search, start) !== -1 } } }) }";
    // Copied from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes#Polyfill
    public static final String NASHORN_POLYFILL_ARRAY_PROTOTYPE_INCLUDES  = "if (!Array.prototype.includes) { Object.defineProperty(Array.prototype, 'includes', { value: function(valueToFind, fromIndex) { if (this == null) { throw new TypeError('\"this\" is null or not defined'); } var o = Object(this); var len = o.length >>> 0; if (len === 0) { return false; } var n = fromIndex | 0; var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0); function sameValueZero(x, y) { return x === y || (typeof x === 'number' && typeof y === 'number' && isNaN(x) && isNaN(y)); } while (k < len) { if (sameValueZero(o[k], valueToFind)) { return true; } k++; } return false; } }); }";

    @Test
    public void testStringIncludesWithPolyfill() throws Exception {
        runScript(NASHORN_POLYFILL_STRING_PROTOTYPE_INCLUDES, "'[1, 2, 3]'.includes(2)");
    }

    @Test(expected=javax.script.ScriptException.class)
    public void testStringIncludesWithoutPolyfill() throws Exception {
        runScript(null, "'[1, 2, 3]'.includes(2)");
    }

    @Test
    public void testArrayIncludesWithPolyfill() throws Exception {
        runScript(NASHORN_POLYFILL_ARRAY_PROTOTYPE_INCLUDES, "[1, 2, 3].includes(2)");
    }

    @Test(expected=javax.script.ScriptException.class)
    public void testArrayIncludesWithoutPolyfill() throws Exception {
        runScript(null, "[1, 2, 3].includes(2)");
    }

    private void runScript(final String polyfill, final String booleanExpression) throws ScriptException {
        final ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
        final ScriptEngine        scriptEngine        = scriptEngineManager.getEngineByName("nashorn");
        Assert.assertNotNull(scriptEngine);
        if (null != polyfill) {
            scriptEngine.eval(polyfill);
        }
        final Object booleanExpressionResult = scriptEngine.eval(booleanExpression);    // returns Boolean object
        Assert.assertNotNull(booleanExpressionResult);
        Assert.assertEquals(booleanExpressionResult.getClass(), Boolean.class);
        System.out.println(booleanExpression + " = " + booleanExpressionResult.toString());
    }

//复制自https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes#Polyfill
公共静态最终字符串NASHORN_POLYFILL_String_PROTOTYPE_INCLUDES=“if（！String.PROTOTYPE.INCLUDES）{Object.defineProperty（String.PROTOTYPE，'INCLUDES'，{value:function（search，start）{if（typeof start！='number'）{start=0}if（start+search.length>this.length）{return false}否则{返回this.indexOf（search，start）！=-1} }) }";
//抄袭https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes#Polyfill
公共静态最终字符串NASHORN\u POLYFILL\u ARRAY\u PROTOTYPE\u INCLUDES=“if（！ARRAY.PROTOTYPE.INCLUDES）{Object.defineProperty（ARRAY.PROTOTYPE，'INCLUDES'，{value:function（valueToFind，fromIndex）{if（this==null）{throw new TypeError（'\'this\'为null或未定义'）；}var o=Object this；var len len o=o.length>>0；if（len==0）{return false；}var n=fromIndex | 0；var k=Math.max（n>=0？n:len-Math.abs（n，0）；函数sameValueZero（x，y）{return x==y | |（typeof x==number'&typeof y==number'&isNaN（x）&isNaN（y））}而（k

因为

includes

来自ecmascript 2016？您知道是否有一个Java兼容的JavaScript解析器将包含ecmascript 2016吗？我如何使用您在我的示例中引用的polyfill？在评估使用String.prototype.includes函数的代码之前，从该页面“评估”该polyfill代码。