export default class StringUtil { static format(str: string, ...arg: any[]) { let a = str; for (let k in arg) { if(arg[k]!==undefined && arg[k]!==null) { a = a.replace("{" + k + "}", String(arg[k])) } } return a } static isEmpty(str:string) { if(str===null || str===undefined || str==="") { return true } return false } }