(proto => {
function myCall(thisArg, ...args) {
thisArg = thisArg == undefined ? window : thisArg;
let type = typeof thisArg;
if (!/^(object|function)$/.test(type)) {
if (/^(symbol|bigint)$/.test(type)) {
thisArg = Object(thisArg);
} else {
thisArg = new thisArg.constructor(thisArg);
}
}
let key = Symbol('key');
thisArg[key] = this;
let result = thisArg[key](...args);
delete thisArg[key];
return result;
}
proto.myCall = myCall;
})(Function.prototype)
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標籤：JavaScript
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