fis_h5_school/public/js/polyfill.js

if (!Array.prototype.at) {
    // eslint-disable-next-line no-extend-native
    Object.defineProperty(Array.prototype, 'at', {
        value: function (index) {
            // 将索引转换为整数
            index = Math.trunc(index) || 0;
            // 如果索引为负数，则从数组末尾开始计算索引位置
            if (index < 0) {
                index += this.length;
            }
            // 如果索引越界，则返回 undefined
            if (index < 0 || index >= this.length) {
                return undefined;
            }
            // 返回指定索引位置的元素
            return this[index];
        },
        enumerable: false,
        configurable: true,
        writable: true
    });
}

if (typeof ArrayBuffer !== 'undefined' && !ArrayBuffer.hasOwnProperty('byteLength')) {
    Object.defineProperty(ArrayBuffer, 'byteLength', {
        get: function () {
            return this.byteLength || this.length;
        }
    });
}

if (typeof structuredClone === "undefined") {
    // 如果浏览器不支持 structuredClone 方法，则定义一个备用方法
    function structuredClone(obj) {
        if (obj === null || typeof obj !== "object") {
            return obj;
        }

        if (Array.isArray(obj)) {
            return obj.map(structuredClone);
        }

        if (obj instanceof ArrayBuffer || ArrayBuffer.isView(obj)) {
            return obj.slice(0);
        }

        const cloned = Object.create(Object.getPrototypeOf(obj));
        const props = Object.getOwnPropertyNames(obj);

        props.forEach((prop) => {
            const descriptor = Object.getOwnPropertyDescriptor(obj, prop);
            if (descriptor) {
                descriptor.value = structuredClone(descriptor.value);
                Object.defineProperty(cloned, prop, descriptor);
            }
        });

        return cloned;
    }
}