分享10个超实用的jQuery代码片段
jjfat 11年前
jQuery以其强大的功能和简单的使用成为了前端开发者最喜欢的JS类库，在这里我们分享一组实用的jQuery代码片段，希望大家喜欢！
jQuery平滑回到顶端效果
$(document).ready(function() { $("a.topLink").click(function() { $("html, body").animate({ scrollTop: $($(this).attr("href")).offset().top + "px" }, { duration: 500, easing: "swing" }); return false; }); }); jQuery处理图片尺寸
$(window).bind("load", function() { // 图片修改大小 $('#imglist 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; } if(height > maxHeight){ ratio = maxHeight / height; $(this).css("height", maxHeight); $(this).css("width", width * ratio); width = width * ratio; } }); }); jQuery实现的滚动自动加载代码
var loading = false; $(window).scroll(function(){ if((($(window).scrollTop()+$(window).height())+250)>=$(document).height()){ if(loading == false){ loading = true; $('#loadingbar').css("display","block"); $.get("load.php?start="+$('#loaded_max').val(), function(loaded){ $('body').append(loaded); $('#loaded_max').val(parseInt($('#loaded_max').val())+50); $('#loadingbar').css("display","none"); loading = false; }); } } }); $(document).ready(function() { $('#loaded_max').val(50); }); jQuery测试密码强度
$('#pass').keyup(function(e) { var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*\W).*$", "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实现的DIv高度保持一致
var maxHeight = 0; $("div").each(function(){ if ($(this).height() > maxHeight) { maxHeight = $(this).height(); } }); $("div").height(maxHeight); 简单处理IE6上PNG格式文件
$('.pngfix').each( function() { $(this).attr('writing-mode', 'tb-rl'); $(this).css('background-image', 'none'); $(this).css( 'filter', 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src="path/to/image.png",sizingMethod="scale")'); }); 将class=pngfix添加到需要处理的对象即可。
jQuery处理JSON
function parseJson(){ //Start by calling the json object, I will be using a //file from my own site for the tutorial //Then we declare a callback function to process the data $.getJSON('hcj.json',getPosts); //The process function, I am going to get the title, //url and excerpt for 5 latest posts function getPosts(data){ //Start a for loop with a limit of 5 for(var i = 0; i < 5; i++){ //Build a template string of //the post title, url and excerpt var strPost = '<h2>' + data.posts[i].title + '</h2>' + '<p>' + data.posts[i].excerpt + '</p>' + '<a href="' + data.posts[i].url + '" title="Read ' + data.posts[i].title + '">Read ></a>'; //Append the body with the string $('body').append(strPost); } } } //Fire off the function in your document ready $(document).ready(function(){ parseJson(); }); jQuery实现让整个div可以被点击
$(".myBox").click(function(){ window.location=$(this).find("a").attr("href"); return false; }); jQuery实现的非死book风格的图片预加载效果
var nextimage = "http://www.gbtags.com/gb/networks/uploadimgthumb/55d67b14-fb25-45e7-acc8-211a41047ef0.jpg"; $(document).ready(function(){ window.setTimeout(function(){ var img = $("<img>").attr("src", nextimage).load(function(){ $('div').append(img); }); }, 100); });