jQuery如今已经成为Web开发中最流行的JavaScript库，通过jQuery和大量的插件，你可以轻松实现各种绚丽的效果。本文将为你介绍一些jquery实用的技巧，希望可以帮助你更加高效地使用jQuery。
收集的35个 jQuery 小技巧/代码片段，可以帮你快速开发.
1. 禁止右键点击
$(document).ready(function(){ $(document).bind("contextmenu",function(e){ return false; }); });
2. 隐藏搜索文本框文字
Hide when clicked in the search field, the value.(example can be found below in the comment fields) $(document).ready(function() { $("input.text1").val("Enter your search text here"); textFill($('input.text1')); }); function textFill(input){ //input focus text function var originalvalue = input.val(); input.focus( function(){ if( $.trim(input.val()) == originalvalue ){ input.val(''); } }); input.blur( function(){ if( $.trim(input.val()) == '' ){ input.val(originalvalue); } }); }
3. 在新窗口中打开链接
XHTML 1.0 Strict doesn't allow this attribute in the code, so use this to keep the code valid. $(document).ready(function() { //Example 1: Every link will open in a new window $('a[href^="http://"]').attr("target", "_blank"); //Example 2: Links with the attribute will only open in a new window $('a[@rel$='external']').click(function(){ this.target = "_blank"; }); }); // how to use <a href="https://www.opensourcehunter.com" rel=external>open link</a>
4. 检测浏览器
注: 在版本jQuery 1.4中，$.support 替换掉了$.browser 变量
$(document).ready(function() { // Target Firefox 2 and above if ($.browser.mozilla && $.browser.version >= "1.8" ){ // do something } // Target Safari if( $.browser.safari ){ // do something } // Target Chrome if( $.browser.chrome){ // do something } // Target Camino if( $.browser.camino){ // do something } // Target Opera if( $.browser.opera){ // do something } // Target IE6 and below if ($.browser.msie && $.browser.version <= 6 ){ // do something } // Target anything above IE6 if ($.browser.msie && $.browser.version > 6){ // do something } });
5. 预加载图片
This piece of code will prevent the loading of all images, which can be useful if you have a site with lots of images. $(document).ready(function() { jQuery.preloadImages = function() { for(var i = 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)>").attr("src", arguments[i]); } } // how to use $.preloadImages("image1.jpg"); });
6. 页面样式切换
$(document).ready(function() { $("a.Styleswitcher").click(function() { //swicth the LINK REL attribute with the value in A REL attribute $('link[rel=stylesheet]').attr('href' , $(this).attr('rel')); }); // how to use // place this in your header <LINK rel=stylesheet type=text/css href="https://www.jb51.net/default.css"> // the links <A href="#" rel=https://www.jb51.net/default.css>Default Theme</A> <A href="#" rel=red.css>Red Theme</A> <A href="#" rel=blue.css>Blue Theme</A> });
7. 列高度相同
如果使用了两个CSS列，使用此种方式可以是两列的高度相同。
$(document).ready(function() { function equalHeight(group) { tallest = 0; group.each(function() { thisHeight = $(this).height(); if(thisHeight > tallest) { tallest = thisHeight; } }); group.height(tallest); } // how to use $(document).ready(function() { equalHeight($(".left")); equalHeight($(".right")); }); });
8. 动态控制页面字体大小
用户可以改变页面字体大小
$(document).ready(function() { // Reset the font size(back to default) var originalFontSize = $('html').css('font-size'); $(".resetFont").click(function(){ $('html').css('font-size', originalFontSize); }); // Increase the font size(bigger font0 $(".increaseFont").click(function(){ var currentFontSize = $('html').css('font-size'); var currentFontSizeNum = parseFloat(currentFontSize, 10); var newFontSize = currentFontSizeNum*1.2; $('html').css('font-size', newFontSize); return false; }); // Decrease the font size(smaller font) $(".decreaseFont").click(function(){ var currentFontSize = $('html').css('font-size'); var currentFontSizeNum = parseFloat(currentFontSize, 10); var newFontSize = currentFontSizeNum*0.8; $('html').css('font-size', newFontSize); return false; }); });
9. 返回页面顶部功能
For a smooth(animated) ride back to the top(or any location). $(document).ready(function() { $('a[href*=#]').click(function() { if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) { var $target = $(this.hash); $target = $target.length && $target || $('[name=' + this.hash.slice(1) +']'); if ($target.length) { var targetOffset = $target.offset().top; $('html,body') .animate({scrollTop: targetOffset}, 900); return false; } } }); // how to use // place this where you want to scroll to <A name=top></A> // the link <A href="#top">go to top</A> });
10. 获得鼠标指针XY值