jQuery memory leak solution

In this article, we share the jQuery memory leak solution for your reference. The specific content is as follows

Idea: Extend the method of deleting jquery element objects for JQuery, greatly reducing the pressure of memory leaks

;(function($){
 if(!$.lui.widget) $.lui.widget = {};
 //$.lui.newGuid()生成随机32位id
 
 //如果采用此方式多次生成jquery对象的话，html代码字符串会在内存中多次重复，占用额外的内容，也会有泄露。而$("<span></span>").attr(&#39;id&#39;,_id)写法无此问题。
 
 $.lui.widget.__clean$ = $("<span id=&#39;" + $.lui.newGuid()+ "&#39;></span>");
 /**
 * 释放jquery对象，无返回值。此方法用以解决jquery的内存泄露问题
 */
 $.fn.del = function( selector, keepData ) {
 if ( !selector || $.filter( selector, [ this ] ).length ) {
  // 释放dom对象
  var item = $(this);
  var clearItem = $.lui.widget.__clean$;
  item.appendTo(clearItem);
  $(&#39;*&#39;,clearItem).each(function(i, e) {
  (events = $.data(this, &#39;events&#39;)) && $.each(events, function(i, e1) {
   $(e).unbind(i + &#39;.*&#39;);
  });
  $.event.remove(this);
  $.removeData(this);
  });
  clearItem[0].innerHTML = &#39;&#39;;
  item = null;
 }
 };
 
 /**
 * 计算字符串在某元素上不折行时的长度
 * @param {jQuery} $Element jquery元素
 * @param {String} str 字符串
 * @returns  {Number}  字符串长度（px)
 */
 $.lui.widget.clacStrLength = function($Element,str){
   var _id = $.lui.newGuid();
   var $tmpSpan = $("<span></span>").attr(&#39;id&#39;,_id).css({
    &#39;position&#39;:&#39;absolute&#39;,
    &#39;top&#39;:&#39;-1000px&#39;
   }).appendTo(&#39;body&#39;);
   var _width = $tmpSpan.css({
    &#39;font-family&#39;:$Element.css(&#39;font-family&#39;),
    &#39;font-size&#39;:$Element.css(&#39;font-size&#39;),
    &#39;letter-spacing&#39;:$Element.css(&#39;letter-spacing&#39;),
    &#39;word-spacing&#39;:$Element.css(&#39;word-spacing&#39;),
    &#39;text-indent&#39;:$Element.css(&#39;text-indent&#39;)
   }).text(str).innerWidth();
   $tmpSpan.del();
   $tmpSpan = null;
   return _width;
 };
 
 /**
 * 在某元素上按像素截取字符串 （采用浏览器默认处理空白方式，不适用于复杂场景，仅用于不换行情况下按像素截取字符串）
 * @param $Element jquery元素（该元素的字体设置必须已经确定）
 * @param str 字符串
 * @param limit  像素值
 * @returns 按像素截取后的字符串
 */
 $.lui.widget.substrByPx = function($Element,str,limit){
 if($Element === undefined || !$Element instanceof $) return &#39;&#39;;
 if(str === undefined || typeof str != &#39;string&#39;) return &#39;&#39;;
 if(limit === undefined) return str;
 if(!str || limit <=0 ) return &#39;&#39;;
 var _str = new String(str);
 
 var _id = $.lui.newGuid();
 var $tmpSpan = $("<span></span>").attr(&#39;id&#39;,_id).css({
  &#39;position&#39;:&#39;absolute&#39;,
  &#39;top&#39;:&#39;-1000px&#39;
 }).appendTo(&#39;body&#39;);
 var _width = $tmpSpan.css({
  &#39;font-family&#39;:$Element.css(&#39;font-family&#39;),
  &#39;font-size&#39;:$Element.css(&#39;font-size&#39;),
  &#39;letter-spacing&#39;:$Element.css(&#39;letter-spacing&#39;),
  &#39;word-spacing&#39;:$Element.css(&#39;word-spacing&#39;),
  &#39;text-indent&#39;:$Element.css(&#39;text-indent&#39;)
 }).text(str).innerWidth();
 while( _width >limit){
  _str = _str.substring(0, _str.length-1);
  _width = $tmp.text(_str).innerWidth();
 }
 $tmpSpan.del();
 $tmpSpan = null;
 return _str;
 }; 
})(jQuery);

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