用JS实现的类似QQ密码的输入特效

<input ID="_PSD"></input>

<script>

function passwordText(ID,pd,mark){

mark=mark||"*"

var PSD=document.getElementById(ID)

var password=pd

var lh=PSD.value.length

setInterval(function(){

if(PSD.value.length!=lh){

if(PSD.value.length>lh)run(1)

else run(0)

lh=PSD.value.length

}

},1)

function run(n){

switch(n){

case 0:

password.length-=1

break

case 1:

password.push(PSD.value.charAt(PSD.value.length-1))

break

}

PSD.value=""

for(var i=0;i<password.length-1;i++)

PSD.value+=mark

if(password.length)

PSD.value+=password[password.length-1]

}

}

var password=[]

passwordText("_PSD",password,"*")

</script>