jquery before()和insertBefore()函式例項
阿新 • • 發佈:2019-01-24
在jquery中,before()和insertBefore()函式都有著一樣的功能,一樣的目的,也就是新增文字或html內容到匹配元素的前面,其主要的區別在於語法上的區別。
例如:
<divclass="prettyBox">I'm a ipman</div>
<divclass="prettyBox">I'm a ipman 2</div>
1 $(‘selector’).before(‘new content’);
$(‘.prettyBox’).before(“<div class=”newPrettybox”>Ironman</div>”);
2 $(‘new content’).insertBefore(‘selector’);
$("<divclass='newPrettybox'>Iron man</div>").insertBefore('.prettyBox');
結果:
以上的兩個方法都是完成相同的任務,但是在語法上是不一樣的,其結果如下:
<divclass='newPrettybox'>Iron man</div>
<divclass="prettyBox">
I'm a ipman
</div>
<divclass='newPrettybox'>Iron man</div>
<divclass="prettyBox">
I'm a ipman 2
具體的程式碼如下:
<html> <head> <script type="text/javascript" src="../jquery-1.11.1.min.js"></script> <style type="text/css"> .prettyBox{ padding:8px; background:grey; margin-bottom:8px; width:300px; height:100px; } .newPrettybox{ padding:8px; background:red; margin-bottom:8px; width:200px; height:50px; } </style> </head> <body> <h1>jquery before() and insertBefore() example</h1> <div class="prettyBox">ip man</div> <div class="prettyBox">ip man2</div> <p> <button id="before">before()</button> <button id="insertBefore">insertBefore()</button> <button id="reset">reset</button> </p> <script type="text/javascript"> $("#before").click(function(){ $('.prettyBox').before("<div class='newPrettyBox'>iron man</div>"); }); $("#insertBefore").click(function(){ $("<div class='newPrettybox'>iron man</div>").insertBefore('.prettyBox'); }); $("#reset").click(function(){ location.reload(); }); </script> </body> </html>
效果: