function getalls()
{
var inputs=document.getElementsByTagName('input');
for( var i=0;i<inputs.length;i++)
{
var input=inputs[i];
input.onclick =btnClick;
}
}
function btnClick() {
var inputs = document.getElementsByTagName('input');
for (var i = 0; i < inputs.length; i++) {
var input = inputs[i];
if (input == window.event.srcElement) {
input.value = "wuwu";
}
else {
input.value = "haha";
}
}
}
</script>
<body onload="getalls()">
<input type="button" value="haha" />
<input type="button" value="haha" />
<input type="button" value="haha" />
<input type="button" value="haha" />
</body>