jquery几秒钟之后跳转页面

　　　　<script>
window.onload = function() {
var el = document.getElementById('js-tip-timer'), i = 5;
var interval = setInterval(function() {
if (i) {
el.innerHTML = i;
i--;
} else {
el.innerHTML = i;
// TODO set location
window.location.href = contentPath + '/index.html';
}
}, 1000);
}
</script>