JS工具类

//枚举
class Enum {
    constructor(...args) {
        Array.from(args).forEach((arg) => {
            this[arg] = arg;
        });
    }
}
//深度拷贝
function deepclone(obj) {
    let rent;
    if(Array.isArray(obj)) {
        rent = [];
    }else if(obj.constructor === Object) {
        rent = {};
    }else {
        return obj;
    }
    if(Array.isArray(obj)) {
        for(var i = 0; i < obj.length; i++) {
            rent.push(deepclone(obj[i]));
        }
    }
    if(obj.constructor === Object) {
        for(var key in obj) {
            rent[key] = deepclone(obj[key]);
        }
    }
    return rent;
}
//多对象合并
function merage(deep = false, target = {}, ...args) {
    console.log(args)
    var src, copy, options, clone;
    for(var i = 0; i < args.length; i++) {
        options = args[i];
        if(options != null) {
            for(var key in options) {
                src = target[key];
                copy = options[key];
                if(src != copy) {
                    if(deep && copy && (copy.constructor === Object || Array.isArray(copy))) {
                        if(copy.constructor === Object) {
                            clone = src && src.constructor === Object ? src : {};
                        }else if(Array.isArray(copy)) {
                            clone = src && Array.isArray(src) ? src : [];
                        }
                        target[key] = merage(true, clone, copy);
                    }else {
                        target[key] = options[key];
                    }
                }
            }
        }
    }
    return target;
}
//手写promise
(function(){
    console.log("手写promise")
    const PENDING = "pengding";
    const RESLOVED = "resloved";
    const REJECTED = "rejected";
    function MyPromise(executor) {
        this.status = PENDING;
        this.data = undefined;
        this.callbacks = [];
        var resolve = (value) => {
            if(this.status !== PENDING) {
                return;
            }
            this.status = RESLOVED;
            this.data = value;
            if(this.callbacks.length > 0) {
                setTimeout(() => {
                    this.callbacks.forEach(callbackObj => {
                        callbackObj.onResloved(value);
                    })
                })
            }
        };
        var reject = (error) => {
            if(this.status !== PENDING) {
                return;
            }
            this.status = REJECTED;
            this.data = error;
            if(this.callbacks.length > 0) {
                setTimeout(() => {
                    this.callbacks.forEach(callbackObj => {
                        callbackObj.onRejected(error);
                    })
                })
            }
        };
        try {
            executor(resolve, reject);
        } catch (e) {
            reject(e);
        }
    };
    MyPromise.prototype.then = function (onResloved, onRejected) {
        return new MyPromise((resolve, reject) => {
            var self = this;
            function handle(callback) {
                try {
                    const result = callback(self.data);
                    if(result instanceof MyPromise) {
                        result.then(
                            value => {resolve(value)},
                            error => {reject(error)}
                        )
                    }else {
                        resolve(result);
                    }
                } catch (e) {
                    reject(e);
                }
            };
            if(this.status === PENDING) {
                this.callbacks.push({
                    onResloved: () => {
                        handle(onResloved);
                    },
                    onRejected: () => {
                        handle(onRejected);
                    }
                })
            }else if(this.status === RESLOVED) {
                setTimeout(() => {
                    handle(onResloved);
                });
            }else if(this.status === REJECTED) {
                setTimeout(() => {
                    handle(onRejected);
                });
            }
        });
    };
    MyPromise.prototype.catch = function(onRejected) {
        return this.then(undefined, onRejected);
    };
    MyPromise.resolve = function(value) {
        return new MyPromise((resolve, reject) => {
            resolve(value);
        });
    };
    MyPromise.reject = function(error) {
        return new MyPromise((resolve, reject) => {
            reject(error);
        });
    };
    //只有当所有promise成功时才成功
    MyPromise.all = function(promiss) {
        return new MyPromise(async (resolve, reject) => {
            let result = [];
            let isReject = false;
            for(var i = 0; i < promiss.length; i++) {
                try {
                    let rent = await promiss[i];
                    result.push(rent)
                } catch (error) {
                    result.push(error)
                    isReject = true;
                    break;
                }
            }
            if(!isReject) {
                resolve(result);
            }else{
                reject(result);
            }
        });
    };
    //其结果由第一个完成的promise决定
    MyPromise.race = function(promiss) {
        return new MyPromise(async (resolve, reject) => {
            let result = [];
            let isReject = false;
            for(var i = 0; i < promiss.length; i++) {
                try {
                    let rent = await promiss[i];
                    result.push(rent)
                } catch (error) {
                    result.push(error)
                    if(i = 0) {
                        isReject = true;
                        break;
                    }
                }
            }
            if(!isReject) {
                resolve(result);
            }else{
                reject(result);
            }
        });
    };
    window.MyPromise = MyPromise;
})();
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