JS 判断以指定字符串结尾

              function endWith(str, endStr) {
                str = str.trim()
                let d = str.length - endStr.length
                return d >= 0 && str.lastIndexOf(endStr) == d
              }

 

let reg = /(.+(?=[<aaaa>]$))/
              console.log( 'a<aaaa>'), reg.test('<aaaa>'))