很棒的jQuery代码片段分享

　jQuery实现的内链接平滑滚动　　不需要使用太复杂的插件，只要使用下载这段代码即可实现基于内部链接的平滑滚动
$('a[href^="#"]').bind('click.smoothscroll',function(e) {
e.preventDefault();
 
var anchor = this.hash,
$target = $(target);
 
$('html, body').stop().animate({
'scrollTop': $target.offset().top
}, 500, 'swing', function () {
window.location.hash = anchor;
});
 
});使用jQuery获取所有节点var $element = $('#gbtags');
    var $nodes = $element.contents();
    $nodes.each(function() {
        if(this.nodeType === 3 &amp;&amp; $.trim($(this).text())) {
        $(this).wrap('');
    }
});限制选择框选择个数$("#categories option").click(function(e){
    if ($(this).parent().val().length < 2) {
        $(this).removeAttr("selected");
    }
});jQuery使用通配符来删除classvar _c = 'your-icon-class'
  
$('.currency').removeClass (function (index, css) {
    return (css.match (/icon-S+/g) || []).join(' ');
}).addClass('icon-'+_c);切换启用和禁用/* HTML
|
|
<input type="text" value="欢迎访问www.admin10000.com" /><input type="button" value="禁用按钮" />
|
|
*/
 
// Plugin
(function ($) {
    $.fn.toggleDisabled = function () {
        return this.each(function () {
            var $this = $(this);
            if ($this.attr('disabled')) $this.removeAttr('disabled');
            else $this.attr('disabled', 'disabled');
        });
    };
})(jQuery);
 
// TEST
$(function () {
    $('input:button').click(function () {
        $('input:text').toggleDisabled();
    });
});平滑滚动返回顶端<h1 id="anchor">admin10000.com</h1>
<a class="topLink" href="#anchor">返回顶端</a>
 
$(document).ready(function () {
 
    $("a.topLink").click(function () {
        $("html, body").animate({
            scrollTop: $($(this).attr("href")).offset().top + "px"
        }, {
            duration: 500,
            easing: "swing"
        });
        return false;
    });
 
});使用jQuery和Google Analytics来跟踪表单var array1 = [];
$(document).ready(function () {
    $('input').change(function () {
        var formbox = $(this).attr('id');
        array1.push(formbox);
        console.log("you filled out box " + array1);
    });
    $('#submit').click(function () {
        console.log('tracked ' + array1);
        //alert('this is the order of boxes you filled out: ' + array1);
        _gaq.push(['_trackEvent', 'Form', 'completed', '"' + array1 + '"']);
    });
});超简单的密码强度提示$('#pass').keyup(function (e) {
    var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*W).*$", "g");
    var mediumRegex = new RegExp("^(?=.{7,})(((?=.*[A-Z])(?=.*[a-z]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[a-z])(?=.*[0-9]))).*$", "g");
    var enoughRegex = new RegExp("(?=.{6,}).*", "g");
    if (false == enoughRegex.test($(this).val())) {
        $('#passstrength').html('More Characters');
    } else if (strongRegex.test($(this).val())) {
        $('#passstrength').className = 'ok';
        $('#passstrength').html('Strong!');
    } else if (mediumRegex.test($(this).val())) {
        $('#passstrength').className = 'alert';
        $('#passstrength').html('Medium!');
    } else {
        $('#passstrength').className = 'error';
        $('#passstrength').html('Weak!');
    }
    return true;
});jQuery生成一个自动停靠页尾效果// Window load event used just in case window height is dependant upon images
$(window).bind("load", function () {
    var footerHeight = 0,
        footerTop = 0,
        $footer = $("#footer");
    positionFooter();
 
    function positionFooter() {
        footerHeight = $footer.height();
        footerTop = ($(window).scrollTop() + $(window).height() - footerHeight) + "px";
        /* DEBUGGING
console.log("Document height: ", $(document.body).height());
console.log("Window height: ", $(window).height());
console.log("Window scroll: ", $(window).scrollTop());
console.log("Footer height: ", footerHeight);
console.log("Footer top: ", footerTop);
*/
        if (($(document.body).height() + footerHeight) < $(window).height()) {
            $footer.css({
                position: "absolute"
            }).stop().animate({
                top: footerTop
            });
        } else {
            $footer.css({
                position: "static"
            });
        }
    }
 
    $(window)
        .scroll(positionFooter)
        .resize(positionFooter);
});预防对表单进行多次提交$(document).ready(function() {
  $('form').submit(function() {
    if(typeof jQuery.data(this, "disabledOnSubmit") == 'undefined') {
      jQuery.data(this, "disabledOnSubmit", { submited: true });
      $('input[type=submit], input[type=button]', this).each(function() {
        $(this).attr("disabled", "disabled");
      });
      return true;
    }
    else
    {
      return false;
    }
  });
});图像等比例缩放$(window).bind("load", function() {
     
// IMAGE RESIZE
    $('#product_cat_list img').each(function() {
        var maxWidth = 120;
        var maxHeight = 120;
        var ratio = 0;
        var width = $(this).width();
        var height = $(this).height();
        if(width > maxWidth){
            ratio = maxWidth / width;
            $(this).css("width", maxWidth);
            $(this).css("height", height * ratio);
            height = height * ratio;
        }
        var width = $(this).width();
        var height = $(this).height();
        if(height > maxHeight){
            ratio = maxHeight / height;
            $(this).css("height", maxHeight);
            $(this).css("width", width * ratio);
            width = width * ratio;
        }
    });
     
//$("#contentpage img").show();
     
// IMAGE RESIZE
});鼠标滑动时的渐入和渐出$(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
    });
});让整个DIV可以被点击<div class = "myBox" > 
    < a href = "http://www.admin10000.com" > admin10000.com < /a>
</div > 
 
$(".myBox").click(function(){
    window.location=$(this).find("a").attr("href");
    return false;
});图片预加载(function($) {
  var cache = [];
  // Arguments are image paths relative to the current page.
  $.preLoadImages = function() {
    var args_len = arguments.length;
    for (var i = args_len; i--;) {
      var cacheImage = document.createElement('img');
      cacheImage.src = arguments[i];
      cache.push(cacheImage);
    }
  }
 
jQuery.preLoadImages("image1.gif", "/path/to/image2.png");获取 URL 中传递的参数$.urlParam = function(name){
    var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
    if (!results) { return 0; }
    return results[1] || 0;
}禁用表单的回车键提交$("#form").keypress(function(e) {
  if (e.which == 13) {
    return false;
  }
});