jquery小技巧

1) 禁用鼠标右键单击

　　jQuery程序员可以使用此代码在网页上禁用鼠标右键点击。

$(document).ready(function() {
//catch the right-click context menu
$(document).bind("contextmenu",function(e) {
//warning prompt - optional
alert("No right-clicking!");

//delete the default context menu
return false;
});
});

2) 利用jQuery调整文字大小

　　使用此代码，用户可以重新网站上文字的大小（增大和减少）

$(document).ready(function() {
//find the current font size
var originalFontSize = $('html').css('font-size');

//Increase the text size
$(".increaseFont").click(function() {
var currentFontSize = $('html').css('font-size');
var currentFontSizeNumber = parseFloat(currentFontSize, 10);

var newFontSize = currentFontSizeNumber*1.2;
$('html').css('font-size', newFontSize);
return false;
});

//Decrease the Text Size
$(".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;
});

// Reset Font Size
$(".resetFont").click(function(){
$('html').css('font-size', originalFontSize);
});
});

3) 在新的Windows打开链接

$(document).ready(function() {
//select all anchor tags that have http in the href
//and apply the target=_blank
$("a[href^='http']").attr('target','_blank');
});

4) Style Sheets Swap

$(document).ready(function() {
$("a.cssSwap").click(function() {
//swap the link rel attribute with the value in the rel
$('link[rel=stylesheet]').attr('href' , $(this).attr('rel'));
});
});

5) 回到顶部链接
　
$(document).ready(function() {
//when the id="top" link is clicked
$('#top').click(function() {
//scoll the page back to the top
$(document).scrollTo(0,500);
}
});

6) 获取鼠标光标的x和y轴

$().mousemove(function(e){
//display the x and y axis values inside the P element
$('p').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY);
});

7) 检测当前鼠标坐标

　　使用这个脚本，你可以在jQuery所支持的任何Web浏览器找到当前鼠标的坐标。代码如下：

$(document).ready(function() {
$().mousemove(function(e)
{
$('# MouseCoordinates ').html("X Axis Position = " + e.pageX + " and Y Axis Position = " + e.pageY);
});
});

8) 在jQuery中预加载图片

　　此图像预加载的脚本有助于非常快速加载图像或网页。你不必等待图像加载。代码：

jQuery.preloadImagesInWebPage = function()
{
for(var ctr = 0; ctr<arguments.length; ctr++)
{
jQuery("<img alt="">").attr("src", arguments[ctr]);
}
}

To use the above method, you can use the following piece of code:

$.preloadImages("image1.gif", "image2.gif", "image3.gif");

To check whether an image has been loaded, you can use the following piece of code:

$('#imageObject').attr('src', 'image1.gif').load(function() {
alert('The image has been loaded…');
});