js 正則判斷字元串是否為字母或數字

function checknum(value) {

            var Regx = /^[A-Za-z0-9]*$/;

            if (Regx.test(value)) {

                return true;

            }

            else {

                return false;

            }

        }

轉載于:https://www.cnblogs.com/shosky/archive/2011/06/13/2080056.html