前段时间发布了Jquery类库1.4版本，使用者也越来越多，为了方便大家对Jquery的使用，下面列出了一些Jquery使用技巧。比如有禁止右键点击、隐藏搜索文本框文字、在新窗口中打开链接、检测浏览器、预加载图片、页面样式切换、所有列等高、动态控制页面字体大小、获得鼠标指针的X值Y值、验证元素是否为空、替换元素、延迟加载、验证元素是否存在于Jquery集合中、使DIV可点击、克隆对象、使元素居中、计算元素个数、使用Google主机上的Jquery类库、禁用Jquery效果、解决Jquery类库与其他Javascript类库冲突问题。

具体如下：

1. 禁止右键点击view plaincopy to clipboardprint?

1. $(document).ready(function(){

2. $(document).bind("contextmenu",function(e){

3. return false;

4. });

5. });

2. 隐藏搜索文本框文字view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. $("input.text1").val("Enter your search text here");

3. textFill($('input.text1'));

4. });

5.

6. function textFill(input){ //input focus text function

7. var originalvalue = input.val();

8. input.focus( function(){

9. if( $.trim(input.val()) == originalvalue ){ input.val(''); }

10. });

11. input.blur( function(){

12. if( $.trim(input.val()) == '' ){ input.val(originalvalue); }

13. });

14. }

3. 在新窗口中打开链接view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. //Example 1: Every link will open in a new window

3. $('a[href^="http://"]').attr("target", "_blank");

4.

5. //Example 2: Links with the rel="external" attribute will only open in a new window

6. $('a[@rel$='external']').click(function(){

7. this.target = "_blank";

8. });

9. });

10. // how to use

11. open link

4. 检测浏览器注: 在版本jQuery 1.4中，$.support 替换掉了$.browser 变量。

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1. $(document).ready(function() {

2. // Target firefox 2 and above

3. if ($.browser.mozilla && $.browser.version >= "1.8" ){

4. // do something

5. }

6.

7. // Target Safari

8. if( $.browser.safari ){

9. // do something

10. }

11.

12. // Target Chrome

13. if( $.browser.chrome){

14. // do something

15. }

16.

17. // Target Camino

18. if( $.browser.camino){

19. // do something

20. }

21.

22. // Target Opera

23. if( $.browser.opera){

24. // do something

25. }

26.

27. // Target IE6 and below

28. if ($.browser.msie && $.browser.version <= 6 ){

29. // do something

30. }

31.

32. // Target anything above IE6

33. if ($.browser.msie && $.browser.version > 6){

34. // do something

35. }

36. });

5. 预加载图片view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. jQuery.preloadImages = function()

3. {

4. for(var i = 0; i").attr("src", arguments[i]);

5. }

6. };

7. // how to use

8. $.preloadImages("image1.jpg");

9. });

6. 页面样式切换view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. $("a.Styleswitcher").click(function() {

3. //swicth the LINK REL attribute with the value in A REL attribute

4. $('link[rel=stylesheet]').attr('href' , $(this).attr('rel'));

5. });

6. // how to use

7. // place this in your header

8.

9. // the links

10. Default Theme

11. Red Theme

12. Blue Theme

13. });

7. 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。

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1. $(document).ready(function() {

2. function equalHeight(group) {

3. tallest = 0;

4. group.each(function() {

5. thisHeight = $(this).height();

6. if(thisHeight > tallest) {

7. tallest = thisHeight;

8. }

9. });

10. group.height(tallest);

11. }

12. // how to use

13. $(document).ready(function() {

14. equalHeight($(".left"));

15. equalHeight($(".right"));

16. });

17. });

8. 动态控制页面字体大小用户可以改变页面字体大小

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1. $(document).ready(function() {

2. // Reset the font size(back to default)

3. var originalFontSize = $('html').css('font-size');

4. $(".resetFont").click(function(){

5. $('html').css('font-size', originalFontSize);

6. });

7. // Increase the font size(bigger font0

8. $(".increaseFont").click(function(){

9. var currentFontSize = $('html').css('font-size');

10. var currentFontSizeNum = parseFloat(currentFontSize, 10);

11. var newFontSize = currentFontSizeNum*1.2;

12. $('html').css('font-size', newFontSize);

13. return false;

14. });

15. // Decrease the font size(smaller font)

16. $(".decreaseFont").click(function(){

17. var currentFontSize = $('html').css('font-size');

18. var currentFontSizeNum = parseFloat(currentFontSize, 10);

19. var newFontSize = currentFontSizeNum*0.8;

20. $('html').css('font-size', newFontSize);

21. return false;

22. });

23. });

9. 返回页面顶部功能view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. $('a[href*=#]').click(function() {

3. if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'')

4. && location.hostname == this.hostname) {

5. var $target = $(this.hash);

6. $target = $target.length && $target

7. || $('[name=' + this.hash.slice(1) +']');

8. if ($target.length) {

9. var targetOffset = $target.offset().top;

10. $('html,body')

11. .animate({scrollTop: targetOffset}, 900);

12. return false;

13. }

14. }

15. });

16. // how to use

17. // place this where you want to scroll to

18.

19. // the link

20. go to top

21. });

11.获得鼠标指针ＸＹ值view plaincopy to clipboardprint?

1. $(document).ready(function() {

2. $().mousemove(function(e){

3. //display the x and y axis values inside the div with the id XY

4. $('#XY').html("X Axis : " + e.pageX + " | Y Axis " + e.pageY);

5. });

6. // how to use

7.