When to use '$(this)' and 'this' in a jQuery plugin? (Article on net.tutsplus.com) -

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I am now learning jQuery, and Jeffrey was reading an article about him, almost everything is clear, but some point I am still unable to understand.

The problems start with 'Step 3: Creating the plugin', the title 'Title for each', and the next 'Error Checking'. 

  this.each (function () {$ this = $ (this); var title = this.title; if ($ this.is ('a') & amp; $ this Attr ('title')! = '') {This.title = ''; $ this.hover (function (e) {  
 question  
     
  1.  
      This.title  - what is this a method? When we use jQuery, we type  $ (this) .attr ('title')  - and was made to simplify jQuery) code> this.title  is a DOM specification, or is the context of JavaScript embedded methods? 
     
    2.  
  2.  
     I can not understand that  this  is the keyword When, when do we have to  this  and when to use  $ (this) ? Why do we  this.each (func  ..., and not  $ (this) .each (using func  ... (I tested it - and it also works, but what is the difference?) I know that the factory method  $ ()  gives a wrapped set of DOM elements, but why do we use it  this.title  here (and then  $ (this) .attr (' Title ')  jobs)? I did a little test. We can type  this.title  or  in the conditional statement  $ this.attr ('title') instead of the title </code>, but if we only Use something (<code> title </code> or <code> $ (this) .atr ('title') instead of <code> this.title </code> in status. <code > This.title = ''; </code> - This does not work. </p> </li> <li> <p> OK, we have the <code> var title = this.title; </code> is specified. But when we use this variable, why do we declare it? </p> </li> </ol> <p> I think some of you can understand better than me, what I need to understand about, so that I can finish my description ) Thank you very much, if you use JQuery <code> attr (using 'title') it <1}, NewVal) </code> method you are able to apply a single value for all the elements included in your jQuery selector But to change a single element, to manipulate the <code> title </code> attribute of this element New simple </p> </li> <li> <p> The <code> each () </code> function, <code> this </code> parameter is being repeated that before. When running on a collection of DOM elements, <code> this </code> will be a DOM element if you want to use jQuery functions on DOM elements, you need to wrap them in jQuery again, which means that You need to use <code> $ (this) .doAwesomeness () </code> </p> </li> <li> <p> <code> var title </code> possibly <code> $ This.hover () </code> </p> </li> </ol> </div> is being used within the function> </html> <br /> 
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<a href='https://ideassl11.blogspot.com/2013/05/'>May 2013<span class='post-count'>210</span></a>
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<a href='https://ideassl11.blogspot.com/2013/04/'>April 2013<span class='post-count'>194</span></a>
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<a href='https://ideassl11.blogspot.com/2013/03/'>March 2013<span class='post-count'>213</span></a>
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<a href='https://ideassl11.blogspot.com/2013/02/'>February 2013<span class='post-count'>201</span></a>
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<a href='https://ideassl11.blogspot.com/2013/01/'>January 2013<span class='post-count'>201</span></a>
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<a href='https://ideassl11.blogspot.com/2012/09/'>September 2012<span class='post-count'>197</span></a>
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<a href='https://ideassl11.blogspot.com/2012/08/'>August 2012<span class='post-count'>189</span></a>
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<a href='https://ideassl11.blogspot.com/2012/06/'>June 2012<span class='post-count'>209</span></a>
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<a href='https://ideassl11.blogspot.com/2012/05/'>May 2012<span class='post-count'>220</span></a>
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<a href='https://ideassl11.blogspot.com/2012/04/'>April 2012<span class='post-count'>205</span></a>
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<a href='https://ideassl11.blogspot.com/2012/03/'>March 2012<span class='post-count'>185</span></a>
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<a href='https://ideassl11.blogspot.com/2012/02/'>February 2012<span class='post-count'>213</span></a>
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<a href='https://ideassl11.blogspot.com/2012/01/'>January 2012<span class='post-count'>207</span></a>
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<a href='https://ideassl11.blogspot.com/2011/09/'>September 2011<span class='post-count'>228</span></a>
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<a href='https://ideassl11.blogspot.com/2011/08/'>August 2011<span class='post-count'>187</span></a>
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<a href='https://ideassl11.blogspot.com/2011/07/'>July 2011<span class='post-count'>198</span></a>
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<a href='https://ideassl11.blogspot.com/2011/06/'>June 2011<span class='post-count'>216</span></a>
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<a href='https://ideassl11.blogspot.com/2011/05/'>May 2011<span class='post-count'>191</span></a>
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<a href='https://ideassl11.blogspot.com/2011/04/'>April 2011<span class='post-count'>234</span></a>
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<a href='https://ideassl11.blogspot.com/2011/03/'>March 2011<span class='post-count'>183</span></a>
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<a href='https://ideassl11.blogspot.com/2011/02/'>February 2011<span class='post-count'>199</span></a>
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<a href='https://ideassl11.blogspot.com/2011/01/'>January 2011<span class='post-count'>188</span></a>
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<a href='https://ideassl11.blogspot.com/2010/09/'>September 2010<span class='post-count'>208</span></a>
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<a href='https://ideassl11.blogspot.com/2010/08/'>August 2010<span class='post-count'>196</span></a>
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<a href='https://ideassl11.blogspot.com/2010/05/'>May 2010<span class='post-count'>193</span></a>
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<a href='https://ideassl11.blogspot.com/2010/04/'>April 2010<span class='post-count'>187</span></a>
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<a href='https://ideassl11.blogspot.com/2010/03/'>March 2010<span class='post-count'>200</span></a>
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<a href='https://ideassl11.blogspot.com/2010/02/'>February 2010<span class='post-count'>184</span></a>
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<a href='https://ideassl11.blogspot.com/2010/01/'>January 2010<span class='post-count'>203</span></a>
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