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⚡️ avoid duplicate value check to improve performance (#1134)

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Kuitos 2020-12-08 14:40:10 +08:00 committed by GitHub
parent fbbd6f1722
commit a023a5c9b7
1 changed files with 6 additions and 5 deletions
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11
src/sandbox/common.ts
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@ -16,17 +16,18 @@ export function setCurrentRunningSandboxProxy(proxy: WindowProxy | null) {
const functionBoundedValueMap = new WeakMap<Function, Function>();
export function getTargetValue(target: any, value: any): any {
const cachedBoundFunction = functionBoundedValueMap.get(value);
if (cachedBoundFunction) {
return cachedBoundFunction;
}
/*
仅绑定 isCallable && !isBoundedFunction && !isConstructable 的函数对象，如 window.console、window.atob 这类。目前没有完美的检测方式，这里通过 prototype 中是否还有可枚举的拓展方法的方式来判断
@warning 这里不要随意替换成别的判断方式，因为可能触发一些 edge case（比如在 lodash.isFunction 在 iframe 上下文中可能由于调用了 top window 对象触发的安全异常）
*/
if (isCallable(value) && !isBoundedFunction(value) && !isConstructable(value)) {
const cachedBoundValue = functionBoundedValueMap.get(value);
if (cachedBoundValue) {
return cachedBoundValue;
}
const boundValue = Function.prototype.bind.call(value, target);
// some callable function has custom fields, we need to copy the enumerable props to boundValue. such as moment function.
// use for..in rather than Object.keys.forEach for performance reason
// eslint-disable-next-line guard-for-in,no-restricted-syntax