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统计

js判断类型

const opt = Object.prototype.toString;
export function isArray(obj: any): obj is any[] {
return opt.call(obj) === '[object Array]';
}
export function isObject(obj: any): obj is { [key: string]: any } {
return opt.call(obj) === '[object Object]';
}
export function isString(obj: any): obj is string {
return opt.call(obj) === '[object String]';
}
export function isNumber(obj: any): obj is number {
return opt.call(obj) === '[object Number]' && obj === obj; // eslint-disable-line
}
export function isRegExp(obj: any) {
return opt.call(obj) === '[object RegExp]';
}
export function isFile(obj: any): obj is File {
return opt.call(obj) === '[object File]';
}
export function isBlob(obj: any): obj is Blob {
return opt.call(obj) === '[object Blob]';
}
export function isUndefined(obj: any): obj is undefined {
return obj === undefined;
}
export function isNull(obj: any): obj is null {
return obj === null;
}
export function isFunction(obj: any): obj is (...args: any[]) => any {
return typeof obj === 'function';
}
export function isEmptyObject(obj: any): boolean {
return isObject(obj) && Object.keys(obj).length === 0;
}
export function isExist(obj: any): boolean {
return obj || obj === 0;
}
export function isWindow(el: any): el is Window {
return el === window;
}

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