TA貢獻(xiàn)1887條經(jīng)驗(yàn) 獲得超5個(gè)贊
如果不被篡改，則差異相對(duì)較小。但是，如果您依賴于包含原型函數(shù)，那么各種各樣的東西都會(huì)妨礙您期望它工作（甚至可能是偶然的）。這就是為什么您經(jīng)常會(huì)看到庫(kù)直接調(diào)用原型方法，而不是依賴于它們對(duì)單個(gè)對(duì)象的完整性。objobj
請(qǐng)考慮以下情況：
const prop = 'test';
obj = {test: 'example'};
console.log({
'version': 'no tampering!',
'obj.hasOwnProperty': obj.hasOwnProperty(prop),
'Object.prototype.hasOwnProperty': Object.prototype.hasOwnProperty.call(obj, prop)
});
// someone does something you don't expect with obj
obj.hasOwnProperty = () => false;
// NOTE: This at least is a function, there is nothing to stop me from setting it to something that would BREAK the function call...
// E.g. obj.hasOwnProperty = 42;
console.log({
'version': 'some tampering!',
'obj.hasOwnProperty': obj.hasOwnProperty(prop),
'Object.prototype.hasOwnProperty': Object.prototype.hasOwnProperty.call(obj, prop)
});
或者，如果 對(duì)象不繼承原型呢？objObject
const obj = Object.create(null);
console.log(obj.hasOwnProperty);
舉報(bào)