本文實例總結了經典且實用的jQuery代碼開發技巧。分享給大家供大家參考。具體如下：
1. 禁止右鍵點擊
$(document).ready(function(){ $(document).bind("contextmenu",function(e){ return false; });});2. 隱藏搜索文本框文字
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. 在新窗口中打開鏈接
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 rel="external" attribute will only open in a new window $('a[@rel$='external']').click(function(){ this.target = "_blank"; });});// how to use<a rel=external>open link</a>4. 檢測瀏覽器
注: 在版本jQuery 1.4中，$.support 替換掉了$.browser 變量
$(document).ready(function() {// Target Firefox 2 and aboveif ($.browser.mozilla && $.browser.version >= "1.8" ){ // do something}// Target Safariif( $.browser.safari ){ // do something}// Target Chromeif( $.browser.chrome){ // do something}// Target Caminoif( $.browser.camino){ // do something}// Target Operaif( $.browser.opera){ // do something}// Target IE6 and belowif ($.browser.msie && $.browser.version <= 6 ){ // do something}// Target anything above IE6if ($.browser.msie && $.browser.version > 6){ // do something}});5. 預加載圖片
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. 頁面樣式切換
$(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="default.css">// the links<A class=Styleswitcher href="#" rel=default.css>Default Theme</A><A class=Styleswitcher href="#" rel=red.css>Red Theme</A><A class=Styleswitcher href="#" rel=blue.css>Blue Theme</A>});7. 列高度相同
如果使用了兩個CSS列，使用此種方式可以是兩列的高度相同。
$(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. 動態控制頁面字體大小
用戶可以改變頁面字體大小
$(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. 返回頁面頂部功能
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. 獲得鼠標指針ＸＹ值
Want to know where your mouse cursor is?
$(document).ready(function() { $().mousemove(function(e){ //display the x and y axis values inside the div with the id XY $('#XY').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY); });// how to use<DIV id=XY></DIV>});11.返回頂部按鈕
你可以利用 animate 和 scrollTop 來實現返回頂部的動畫，而不需要使用其他插件。
// Back to top$('a.top').click(function () { $(document.body).animate({scrollTop: 0}, 800); return false;});<!-- Create an anchor tag --><a class="top" href="#">Back to top</a>改變scrollTop 的值可以調整返回距離頂部的距離，而 animate 的第二個參數是執行返回動作需要的時間(單位：毫秒)。
今天為大家先介紹一部分jQuery技巧，后續文章會繼續更新，希望大家持續關注。
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