<
input
id
=VC
class
="xinput"
maxlength
=4
size
="5"
onkeydown
="fnKeyDown(event);"
onfocus
="this.select()"
onclick
="this.select()"
onpaste
="return false"
ondrop
="return false"
ondragenter
="return false;"
ondragstart
="return false"
onkeypress
="return keyDigt(event)"
value
=""
/>
ondragstart="return false" 禁止鼠标在网页上拖动
ondragenter 当用户拖曳对象到一个合法拖曳目标时在目标元素上触发
onpaste="return false" 禁止粘贴