zts-js-polyfill/myBind.js

Function.prototype.myBind = function() {
    var arr = []
    if (typeof arguments[0] == "object") {
        arguments[0].funct = this;

        for (const key of arguments) {
            arr.push(key)
        }
        arguments[0].funct.arguments = arr
        return arguments[0]
    } else {
        var obj = {};
        obj.funct = this;
        for (const key of arguments) {
            arr.push(key)
        }
        obj.funct.arguments = arr
        return obj
    }
}


// myBind函数测试用例
var func = function() {
    return this.a + Array.prototype.slice.call(arguments);
}


console.log(func.myBind(1, 2, 3).funct())
    // 输出“undefined2,3"
console.log(func.myBind({ a: 1000 }, 1, 2, 3).funct(4, 5, 6))

// 输出"10001,2,3,4,5,6"