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<input type="hidden" id="wenbena" value="abcdefg" />
<div id="inner"></div>
<script type="text/javascript">
function anninA() {
var wenbenA = document.getElementById("wenbena").value;
var inter = document.getElementById("inner");
var oko = 0;
(function run() {
inter.innerHTML = wenbenA.slice(0,oko++);
if (oko<=wenbenA.length)
setTimeout(run, 500);
})();
}
anninA();
</script>