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Implementation principle of instanceof

2022-04-23 08:05:00 【Pen drawing Acacia】 

function instanceOf(left, right) {
    let leftValue = left.__proto__;
    let rightValue = right.prototype;
    while (true) {
        if (leftValue === null) {
            return false;
        }
        if (leftValue === rightValue) {
          return true;
        }
    leftValue = leftValue.__proto__;
   }
}

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