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JS中怎样判断某个对象是否被GC回收? https://www.zhihu.com/question/345974014/answer/826236205
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| // 需要通过 node --allow-natives-syntax 参数运行 | |
| const { GCSignal, consumeSignals, trackGarbageCollection } = require("gc-signals"); | |
| function fn() { | |
| // 创建两个局部变量 | |
| const a1 = new GCSignal(1); | |
| const a2 = new GCSignal(2); | |
| global.tmp = a2; // 将 a2 变量赋值给全局变量 | |
| const o = {}; | |
| trackGarbageCollection(o, 3); // 跟踪局部变量 o 的 GC 状态，标识为 3 | |
| } | |
| let obj = {}; | |
| trackGarbageCollection(obj, 4); // 跟踪变量 obj 的 GC 状态，标识为 4 | |
| fn(); | |
| // 函数内创建了 3 个局部变量 a1、a2、o | |
| // 但是 a2 赋值给了全局变量 | |
| // 函数调用完后，a1 和 o 会被释放 | |
| %CollectGarbage(null); // V8 Nativa 函数，手动触发 GC | |
| console.log(consumeSignals()); // [1, 3] | |
| obj = undefined; | |
| // obj 原来的值为空对象({})，通过将 obj 设置为 undefined 回收原来的对象 | |
| %CollectGarbage(null); // V8 Nativa 函数，手动触发 GC | |
| console.log(consumeSignals()); // [4] | |
| global.tmp = undefined; // 同上 | |
| %CollectGarbage(null); // V8 Nativa 函数，手动触发 GC | |
| console.log(consumeSignals()); // [2] |
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需要通过
node --allow-natives-syntax gc-track.js运行