12个Jquery使用技巧
2017-09-18 09:04
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1. 禁止右键点击
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$(document).ready(function(){
$(document).bind("contextmenu",function(e){
return false;
});
});
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$(document).ready(function(){
$(document).bind("contextmenu",function(e){
return false;
});
});
2. 预加载图片
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$(document).ready(function(){
jQuery.preloadImages = function()
{
for(var i
= 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)>").attr("src",
arguments[i]);
}
}
// how to use
$.preloadImages("image1.jpg");
});
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$(document).ready(function(){
jQuery.preloadImages = function()
{
for(var i = 0; i<ARGUMENTS.LENGTH; jQuery(?<img { i++)>").attr("src", arguments[i]);
}
}
// how to use
$.preloadImages("image1.jpg");
});
3. 页面样式切换
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$(document).ready(function()
{
$("a.Styleswitcher").click(function()
{
//swicth the LINK REL attribute with the value
in A REL attribute
$('link[rel=stylesheet]').attr('href' ,
$(this).attr('rel'));
});
// how to use
// place this in your header
<LINK rel=stylesheet type=text/css href="default.css">
// the links
<A class=Styleswitcher
href="#" rel=default.css>Default
Theme</A>
<A class=Styleswitcher
href="#" rel=red.css>Red Theme</A>
<A class=Styleswitcher
href="#" rel=blue.css>Blue Theme</A>
});
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$(document).ready(function() {
$("a.Styleswitcher").click(function() {
//swicth the LINK REL attribute with the value in A REL attribute
$('link[rel=stylesheet]').attr('href' , $(this).attr('rel'));
});
// how to use
// place this in your header
<LINK rel=stylesheet type=text/css href="default.css">
// the links
<A class=Styleswitcher href="#" rel=default.css>Default Theme</A>
<A class=Styleswitcher href="#" rel=red.css>Red Theme</A>
<A class=Styleswitcher href="#" rel=blue.css>Blue Theme</A>
});
4. 列高度相同
如果使用了两个CSS列,使用此种方式可以是两列的高度相同。[javascript] view
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$(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($(".right"));
});
});
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$(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($(".right"));
});
});
5. 动态控制页面字体大小
用户可以改变页面字体大小[javascript] view
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$(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;
$('html').css('font-size',
newFontSize);
return false;
});
});
[javascript] view
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$(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;
$('html').css('font-size', newFontSize);
return false;
});
});
6. 返回页面顶部功能
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$(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;
$('html,body')
.animate({scrollTop: targetOffset}, 900);
return false;
}
}
});
// how to use
// place this where you want to scroll to
<A name=top></A>
// the link
<A href="#top">go
to top</A>
});
[javascript] view
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$(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;
$('html,body')
.animate({scrollTop: targetOffset}, 900);
return false;
}
}
});
// how to use
// place this where you want to scroll to
<A name=top></A>
// the link
<A href="#top">go to top</A>
});
7. jQuery延时加载功能
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$(document).ready(function()
{
window.setTimeout(function()
{
// do something
}, 1000);
});
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$(document).ready(function() {
window.setTimeout(function() {
// do something
}, 1000);
});
8. ID与Class之间转换.
当改变Window大小时,在ID与Class之间切换[javascript] view
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$(document).ready(function()
{
function checkWindowSize()
{
if (
$(window).width() > 1200 ) {
$('body').addClass('large');
}
else {
$('body').removeClass('large');
}
}
$(window).resize(checkWindowSize);
});
[javascript] view
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$(document).ready(function() {
function checkWindowSize() {
if ( $(window).width() > 1200 ) {
$('body').addClass('large');
}
else {
$('body').removeClass('large');
}
}
$(window).resize(checkWindowSize);
});
9. 使元素居屏幕中间位置
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$(document).ready(function()
{
jQuery.fn.center = function ()
{
this.css("position","absolute");
this.css("top",
( $(window).height() - this.height()
) / 2+$(window).scrollTop() + "px");
this.css("left",
( $(window).width() - this.width()
) / 2+$(window).scrollLeft() + "px");
return this;
}
$("#id").center();
});
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$(document).ready(function() {
jQuery.fn.center = function () {
this.css("position","absolute");
this.css("top", ( $(window).height() - this.height() ) / 2+$(window).scrollTop() + "px");
this.css("left", ( $(window).width() - this.width() ) / 2+$(window).scrollLeft() + "px");
return this;
}
$("#id").center();
});
10. 引用Google主机上的Jquery类库
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//Example 1
<SCRIPT src="http://www.google.com/jsapi"></SCRIPT>
<SCRIPT type=text/javascript> google.load("jquery", "1.2.6");
google.setOnLoadCallback(function()
{
// do something });
</SCRIPT>
<SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>
// Example 2:(the best and fastest way)
<SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>
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//Example 1
<SCRIPT src="http://www.google.com/jsapi"></SCRIPT>
<SCRIPT type=text/javascript> google.load("jquery", "1.2.6");
google.setOnLoadCallback(function() {
// do something });
</SCRIPT><SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>
// Example 2:(the best and fastest way)
<SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js"></SCRIPT>
11. 禁用Jquery(动画)效果
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$(document).ready(function()
{
jQuery.fx.off = true;
});
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$(document).ready(function() {
jQuery.fx.off = true;
});
12. 与其他Javascript类库冲突解决方案
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$(document).ready(function()
{
var $jq
= jQuery.noConflict();
$jq('#id').show();
});
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