자바스크립트 랜덤 문자열 자바스크립트 랜덤숫자, 랜덤문자 function randomString() { var chars = “0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz”; var string_length = 15; var randomstring = ”; for (var i=0; i<string_length; i++) { var rnum = Math.floor(Math.random() * chars.length); randomstring += chars.substring(rnum,rnum+1); } //document.randform.randomfield.value = randomstring; return randomstring; }