jQuery实现自动滚动到页面顶端的方法

$(".scroll").click(function(event){  //prevent the default action for the click event  event.preventDefault();  //get the full url - like mysitecom/index.htm#home  var full_url = this.href;  //split the url by # and get the anchor target   //name - home in mysitecom/index.htm#home  var parts = full_url.split("#");  var trgt = parts[1];  //get the top offset of the target anchor  var target_offset = $("#"+trgt).offset();  var target_top = target_offset.top;  //goto that anchor by setting the body scroll top to anchor top  $('html, body').animate({scrollTop:target_top}, 500);});​