String.value.trim() 함수

<script>
    //String.value.trim()함수를 사용하기 위한 메소드 선언
    String.prototype.trim = function() {
        a = this
        var search = 0
        while ( a.charAt(search) == " "){
            search = search + 1
        }
        a = a.substring(search, (a.length))
        search = a.length - 1
        while (a.charAt(search) ==" ") {
            search = search - 1
        }
        return a.substring(0, search + 1)
    }
</script>