高效Web开发的10个jQuery代码片段

 $(document).ready(function() {
   if (navigator.userAgent.match(/msie/i) ){
    alert('I am an old fashioned Internet Explorer');
   }
}); 

 $("a[href='#top']").click(function() {
 $("html, body").animate({ scrollTop: 0 }, "slow");
 return false;
}); 

 $(function(){
 var $win = $(window)
 var $nav = $('.mytoolbar');
 var navTop = $('.mytoolbar').length && $('.mytoolbar').offset().top;
 var isFixed=0;

 processScroll()
 $win.on('scroll', processScroll)

 function processScroll() {
 var i, scrollTop = $win.scrollTop()

 if (scrollTop >= navTop && !isFixed) { 
 isFixed = 1
 $nav.addClass('subnav-fixed')
 } else if (scrollTop <= navTop && isFixed) {
 isFixed = 0
  $nav.removeClass('subnav-fixed')
 }
} 

 $('li').replaceWith(function(){
 return $("<div />").append($(this).contents());
}); 

 var responsive_viewport = $(window).width();

/* if is below 481px */
if (responsive_viewport < 481) {
  alert('Viewport is smaller than 481px.');
} /* end smallest screen */ 

 $('img').error(function(){
 $(this).attr('src', 'img/broken.png');
}); 

 $("#textA").bind('copy', function() {
  $('span').text('copy behaviour detected!')
}); 
$("#textA").bind('paste', function() {
  $('span').text('paste behaviour detected!')
}); 
$("#textA").bind('cut', function() {
  $('span').text('cut behaviour detected!')
}); 

 var root = location.protocol + '//' + location.host;
$('a').not(':contains(root)').click(function(){
  this.target = "_blank";
}); 

 $(document).ready(function(){
  $(".thumbs img").fadeTo("slow", 0.6); // This sets the opacity of the thumbs to fade down to 60% when the page loads

  $(".thumbs img").hover(function(){
    $(this).fadeTo("slow", 1.0); // This should set the opacity to 100% on hover
  },function(){
    $(this).fadeTo("slow", 0.6); // This should set the opacity back to 60% on mouseout
  });
}); 

 $('input.nospace').keydown(function(e) {
 if (e.keyCode == 32) {
 return false;
 }
});