javascript - ScriptEngine JavaScript 不支持包含？

Question

我有一些代码如下。

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

但是会抛出如下错误

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)

我可以改用 indexOf(1)，这似乎可行，但是我无法访问此解析器的 includes 是不是有原因？

Answer 1

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 http://www.ecma-international.org/ecma-262/6.0/#sec-string.prototype.includes

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes有一个 String.prototype.includes 的 polyfill。我检查了 polyfill 是否适用于 Nashorn 引擎。