jQuery实用技巧必备（下）

时间:2020-05-14 人气:0

本文实例总结了经典且实用的jQuery代码开发技巧。分享给大家供大家参考。具体如下：
23. jQuery延时加载功能

　　Want to delay something?

$(document).ready(function() {
 window.setTimeout(function() {
  // do something
 }, 1000);
});

24. 移除单词功能

　　Want to remove a certain word(s)?

$(document).ready(function() {
 var el = $('#id');
 el.html(el.html().replace(/word/ig, ""));
});

25. 验证元素是否存在于jquery对象集合中

　　Simply test with the .length property if the element exists.

$(document).ready(function() {
 if ($('#id').length) {
 // do something
 }
});

26. 使整个DIV可点击

　　Want to make the complete div clickable?

$(document).ready(function() {
 $("div").click(function(){
  //get the url from href attribute and launch the url
  window.location=$(this).find("a").attr("href"); return false;
 });
// how to use
<DIV><A href="index.html">home</A></DIV>

});

27. ID与Class之间转换

　　当改变Window大小时，在ID与Class之间切换

$(document).ready(function() {
 function checkWindowSize() {
 if ( $(window).width() > 1200 ) {
  $('body').addClass('large');
 }
 else {
  $('body').removeClass('large');
 }
 }
$(window).resize(checkWindowSize);
});

28. 克隆对象

　　Clone a div or an other element.

$(document).ready(function() {
 var cloned = $('#id').clone();
// how to use
<DIV id=id></DIV>

});

29. 使元素居屏幕中间位置

　　Center an element in the center of your screen.

$(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();
});

30. 写自己的选择器

　　Write your own selectors.

$(document).ready(function() {
 $.extend($.expr[':'], {
  moreThen1000px: function(a) {
   return $(a).width() > 1000;
  }
 });
 $('.box:moreThen1000px').click(function() {
  // creating a simple js alert box
  alert('The element that you have clicked is over 1000 pixels wide');
 });
});

31. 统计元素个数

　　Count an element.

$(document).ready(function() {
 $("p").size();
});

32. 使用自己的Bullets

　　Want to use your own bullets instead of using the standard or images bullets?

$(document).ready(function() {
 $("ul").addClass("Replaced");
 $("ul > li").prepend("‒ ");
 // how to use
 ul.Replaced { list-style : none; }
});

33. 引用Google主机上的Jquery类库

　　Let Google host the jQuery script for you. This can be done in 2 ways.

//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>

34. 禁用Jquery（动画）效果

　　Disable all jQuery effects

$(document).ready(function() {
 jQuery.fx.off = true;
});

35. 与其他Javascript类库冲突解决方案

　　To avoid conflict other libraries on your website, you can use this jQuery Method, and assign a different variable name instead of the dollar sign.

$(document).ready(function() {
 var $jq = jQuery.noConflict();
 $jq('#id').show();
});

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