js表单验证
function checktruename(truename){
    var str=truename;
     //在JavaScript中，正则表达式只能使用"/"开头和结束，不能使用双引号
    var Expression=/[^\u4E00-\u9FA5]/;
    var objExp=new RegExp(Expression);
    if(objExp.test(str)==true){
        return true;
    }else{
        return false;
    }
}    
    function $(id)
    {
        return document.getElementById(id);
    }   
   
    //检查是否非空
    function notEmpty(obj, msg)
    {
        str = obj.value;
        str1 = "";
        for (i = 0; i < str.length; i++)
        {
                if (str.charAt(i) != " ")
                {
                    str1 = str.substr(i, str.length);
                    break;
                }
        }
   
        if (str1 == "")
        {
            alert(msg);
            obj.value = "";
            obj.focus();
            return false;
        }
        else
        {
            return true;
        }
    }
   
    //检查是否为数字
    function isNumber(obj, msg)
    {
        if(isNaN(obj.value))
        {
                if (undefined == msg)
                {
                    msg = "请输入数字！";
                }
       
                alert(msg);
                obj.select();
                return false;
        }
        else
        {
                return true;   
        }
&n