移动开发10段常用的JavaScript代码

在开发移动网站过程中，有一些Javascript代码会经常用到。以下是10段常用的JavaScript代码。需要注意的是某几段代码需要jQuery mobile framework支持。

1.如果网页是在iPhone或Android浏览器中查看，则在主体元素中添加“iPhone”或“Android” 类名
if (navigator.userAgent.match(/iPhone/i)) {$('body').addClass('iPhone');} else if (navigator.userAgent.match(/Android/i)) {         $('body').addClass('Android');}
iPhone用户浏览示例：

Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A537a Safari/419.3
Mozilla/5.0 (iPhone; U; XXXXX like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A477d Safari/419.3

Android用户浏览示例：

Mozilla/5.0 (Linux; U; Android 2.2; en-us; Nexus One Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (Linux; U; Android 1.6; en-gb; Dell Streak Build/Donut AppleWebKit/528.5+ (KHTML, like Gecko) Version/3.1.2 Mobile Safari/ 525.20.1
Mozilla/5.0 (Linux; U; Android 2.1-update1; de-de; HTC Desire 1.19.161.5 Build/ERE27) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17
Mozilla/5.0 (Linux; U; Android 2.2; en-us; DROID2 GLOBAL Build/S273) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (Linux; U; Android 2.2; en-gb; GT-P1000 Build/FROYO) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Mozilla/5.0 (Linux; U; Android 2.1-update1; de-de; E10i Build/2.0.2.A.0.24) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17

2. 移除浏览器地址栏
window.scrollTo(0, 1);
3. 防止网页触摸滚动
notouchmove = function(event) {event.preventDefault();}<div data-role="page" id="home" ontouchmove="notouchmove(event);">...</div>
4. 当横向浏览时显示信息
var updateorientation = function (){var classname = '',top = 100;switch(window.orientation){case 0:classname += "normal";break;case -90:classname += "landscape";break;case 90:classname += "landscape";break;}if (classname == 'landscape') {if ($('#overlay').length === 0) {window.scrollTo(0, 1);$('body').append('<div id="overlay" style="width: 100%; height:' + $(document).height() + 'px"><span style="top: ' + top + 'px">Landscape view is not supported for this page.</span></div>');}} else {$('#overlay').remove();}};Usage:var supportsOrientationChange = "onorientationchange" in window,orientationEvent = supportsOrientationChange ? "orientationchange" : "resize";window.addEventListener(orientationEvent, function() {updateorientation();}, false);
5.显示部分描述信息，当点击时显示完整信息
var truncatedesc = function(trunc, len) {if (trunc) {  var org = trunc;  if (trunc.length > len) {trunc = trunc.substring(0, len);trunc = trunc.replace(/w+$/, '');trunc = '<span class="truncated">' + trunc;trunc += '<strong class="more-description">...</strong></span>';trunc += '<span class="original" style="display: none;">' + org + '</span>';  }  $('.truncated').live("touchstart touchend", function() {$(this).closest('div').find('.original').show();$(this).closest('div').find('.truncated').hide();return false;  });  return trunc;}};Usage:truncatedesc(item.description, 100);
6. 收到成功的Ajax请求时，重定向到另一个页面(jQuery mobile)
var ajaxurl = ‘http://…’; // Your web service URL$.ajax({url: ajaxurl,type: 'GET',processData: false,contentType: "application/json",dataType: "jsonp",success: function(data) {$.mobile.changePage("results.html");},error: function() {alert('Error!');}});
7. 从列表视图的链接中删除活动状态(jQuery mobile)
$('div').live('pageshow', function (event, ui) {$('[data-role=listview] li').removeClass("ui-btn-active");});
8. 从下拉选择中禁用默认的jQuery mobile样式(jQuery mobile)
$(document).bind("mobileinit", function(){  $.mobile.page.prototype.options.keepNative = "select";});
9. 动态更新列表视图(jQuery mobile)
var output  = '<li><img src="' + item.image + '" alt="' + item.title + '" />';output += '<h3><a href="' + item.url + '">' + item.title + '</a></h3>';output += '</li>';$('#mylistul').append(output).listview('refresh');
10. 动态添加表单输入和应用默认样式(jQuery mobile)
var html = '<input type="search" name="suburb" id="suburb" placeholder="Enter suburb" />';$('#searchform').append(html);$('#suburb').textinput();

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