Jquery小知识

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$(document).ready(function(){ 
  $(‘form‘).find("input[type=textarea], input[type=password], textarea").each(function(ev)
  {
      if(!$(this).val()) { 
     $(this).attr("placeholder", "Type your answer here");
  }
  });
});
//获取属性
How can I select an element by name with jQuery?

you can use the attribute selector

$(‘td[name=tcol1]‘) // matches exactly ‘tcol1‘

$(‘td[name^=tcol]‘) // matches those that begin with ‘tcol‘
//通过name 选择

How can I know which radio button is selected via jQuery?

To get the value of the selected radioName item of a form called ‘myForm‘:

$(‘input[name=radioName]:checked‘, ‘#myForm‘).val()//注意这条棒哒哒的选择
//判断哪个radio 被选中

使用trigger()方法模拟事件

$("#btn").trigger("click");
//模拟点击http://blog.csdn.net/lijunling2008live/article/details/7457396

使用标准效果列队，举个例子，我们可以在 <div id="foo"> 的 .slideUp() 和 .fadeIn() 动画之间设置800毫秒的延时:

setTimeout(
  function() 
  {
    //do something special
  }, 5000);

 //实打实的延迟5秒

Jquery小知识

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原文地址：http://www.cnblogs.com/qbuer/p/4649814.html