1、纯js,无动画版本
window.scrollTo(x-coord, y-coord);
window.scrollTo(0,0);
2、纯js,带动画版本
生硬版:
var scrollToTop = window.setInterval(function() {
var pos = window.pageYOffset;
if ( pos > 0 ) {
window.scrollTo( 0, pos - 20 ); // how far to scroll on each step
} else {
window.clearInterval( scrollToTop );
}
}, 16); // how fast to scroll (this equals roughly 60 fps)
流畅版:
(function smoothscroll(){
var currentScroll = document.documentElement.scrollTop || document.body.scrollTop;
if (currentScroll > 0) {
window.requestAnimationFrame(smoothscroll);
window.scrollTo (0,currentScroll - (currentScroll/5));
}
})();