utils 工具方法库

call方法

export function call(Fn,obj,...args) {
    if(obj === undefined || obj === null) {
        obj = globalThis; //全局对像
    }
    //为obj添加临时的方法
    obj.temp = Fn;
    //调用temp方法
    let result = obj.temp(...args);
    //删除temp
    delete obj.temp;
    //返回执行结果
    return result;
}

call测试用例

function add(a,b) {
    console.log(this);
    return a + b + this.c;
}

let obj = {
    c:521
}
window.c = 1;
// let result = call(add,obj,1,2);
// console.log({result});
let result = call(add,null,1,2);
console.log(result);

apply方法

export function apply(Fn,obj,args) {
    if(obj === undefined || obj === null) {
        obj = globalThis;
    }
    //为obj添加临时变量
    obj.temp = Fn;
    //执行方法
    let result = obj.temp(...args);
    //删除临时属性
    delete obj.temp;
    //返回结果
    return result;
}

apply测试用例

import { apply } from './apply';
function add(a,b) {
    console.log(this);
    return a + b + this.c;
}
let obj = {
    c:521
}
window.c = 1;
let result = apply(add,null,[1,2]);
console.log(obj);
console.log(result);