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核心就是左边对象的__proto__的指向是否等于右边的prototype属性
function f1(left,right){
let prototype = right.prototype;
let proto = left.__proto__;
while(true){
if(proto === prototype)
return true;
if(proto === null)
return false;
//若本次查找无结果,则沿着原型链向上查找
proto = proto.__proto__;
}
}
var a=[1,2,3];
console.log(f1(a,Array));
//true