Document
function focus_username(){
var resultObj = document.getElementById("result_username");
resultObj.innerHTML = '请输入你的用户名';
resultObj.style.color = "gray";
}
function blur_username(){
var resultObj = document.getElementById('result_username');
if(document.forml.username.value=='')
{
resultObj.innerHTML = '用户名不能为空！';
}else if(document.forml.username.value.length<5||document.forml.username.value.length>20){
resultObj.innerHTML = '用户名长度必须介于5-20字符串中间！';
}else{
resultObj.innerHTML = '';
}
}
function focus_password(){
var resultObj = document.getElementById("result_password");
resultObj.innerHTML = '请输入你的密码';
resultObj.style.color = "gray";
}
function blur_password(){
var resultObj = document.getElementById('result_password');
if(document.forml.password.value=='')
{
resultObj.innerHTML = '密码不能为空！';
}else if(document.forml.password.value.length<5||document.forml.password.value.length>20){
resultObj.innerHTML = '用户名长度必须介于5-20字符串中间！';
}else{
resultObj.innerHTML = '';
}
}
