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

<div class="equalHeight" style="border:1px solid">
 <p>First Line</p>
 <p>Second Line</p>
 <p>Third Line</p>
</div>
<div class="equalHeight" style="border:1px solid">
 <p>Column Two</p>
</div>
<script src="/UploadFiles/2021-04-02/jquery.min.js">

三、jQuery预加载图像
这个小技巧可以提升页面加载图片的速度：


jQuery.preloadImagesInWebPage = function() {
 for (var ctr = 0; ctr & lt; arguments.length; ctr++) {
  jQuery("").attr("src", arguments[ctr]);
 }
}
// 使用方法：
$.preloadImages("image1.gif", "image2.gif", "image3.gif");
// 检查图片是否被加载
$('#imageObject').attr('src', 'image1.gif').load(function() {
 alert('The image has been loaded…');
});


四、禁用鼠标右键


$(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;
 });
});


五、设定计时器


$(document).ready(function() {
  window.setTimeout(function() {
    // some code
  }, 500);
});


六、计算子元素的个数


<div id="foo">
 <div id="bar"></div>
 <div id="baz">
  <div id="biz"></div>
  <span><span></span></span>
 </div>
</div>
<script src="/UploadFiles/2021-04-02/jquery.min.js">

七、把元素定位到页面中间


<div id="foo" style="width:200px;height: 200px;background: #ccc;"></div>
<script src="/UploadFiles/2021-04-02/jquery.min.js">



                                
                                

                                    jQuery,代码片段 
                                

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