15个jQuery小技巧分享

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$('a.top').click(function(){

    $(document.body).animate({scrollTop:0},800);returnfalse

});

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$.preloadImages =function(){for(var i =0; i

    $('@@##@@').attr('src', arguments[i]);}};

$.preloadImages('img/hover1.png','img/hover2.png');

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$('img').load(function(){

  console.log('image load successful');

});

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$('img').on('error',function(){

  $(this).prop('src','img/broken.png');

});

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$('.btn').hover(function(){

  $(this).addClass('hover');},function(){

    $(this).removeClass('hover');

});

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$('.btn').hover(function(){

  $(this).toggleClass('hover');

});

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$('input[type="submit"]').prop('disabled',true);

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$('input[type="submit"]').removeAttr('disabled');

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$('a.no-link').click(function(e){

  e.preventDefault();

});

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$('.btn').click(function(){

  $('.element').fadeToggle('slow');

});

$('.btn').click(function(){

  $('.element').slideToggle('slow');

});

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$('#accordion').find('.content').hide();

$('#accordion').find('.accordion-header').click(function(){varnext= $(this).next();next.slideToggle('fast');

  $('.content').not(next).slideUp('fast');returnfalse;

});

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var $columns = $('.column');

var height =0;$columns.each(function(){if($(this).height()> height){

    height = $(this).height();}

});

$columns.height(height);

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@-webkit-keyframes fadeIn{

0%{

opacity: 0;/*初始状态*/

flter:"Alpha(Opacity=0)";

}

20%{

opacity: 0.2;

flter:"Alpha(Opacity=0.2)";

}

40%{

opacity: 0.4;

flter:"Alpha(Opacity=0.4)";

}

60%{

opacity: 0.6;

flter:"Alpha(Opacity=0.6)";

}

80%{

opacity: 0.8;

flter:"Alpha(Opacity=0.8)";

}

100%{

opacity: 1.0;

flter:"Alpha(Opacity=1.0)";

}

}

.fadeInShow{

-webkit-animation-name: fadeIn;/*动画名称*/

-webkit-animation-duration: 300ms; /*动画持续时间*/

-webkit-animation-iteration-count: 1; /*动画次数*/

-webkit-animation-delay: 0s; /*延迟时间*/

}

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$('.my-project-selector').hover(function(){

$('#project-popover').css('display','block').addClass('fadeInShow');

},function(){

$('#project-popover').css('display','none').removeClass('fadeInShow');

});

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var obj = $("input[name='projectId']"),arr=[],i=0;

for(;i

　　if(obj[i].checked){

　　　　arr.push(obj[i].value);

　　}

}

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error: function(XMLHttpRequest) {

      //(canceled)==捕捉到的状态值是 “0”

      if(XMLHttpRequest.status=="0"){

      //屏蔽canceled状态值     

   }

}

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$.fn.limit=function(){

var self = $("*[limit]");

   self.each(

function(){

var objString = $.trim($(this).text());

var objLength = $.trim($(this).text()).length;

var num = $(this).attr("limit");

if(objLength > num){

$(this).attr("title",objString);

               objString = $(this).text(objString.substring(0,num) + "...");

            }

         }

   )

};

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使用方式：天空飘来五个字，那都不是事儿

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当前页面写入：

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$("span[limit]").limit();

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//光标定位到字符最后

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$.fn.selectRange = function(start, end) {

returnthis.each(function() {

if(this.setSelectionRange) {

this.focus();

this.setSelectionRange(start, end);

      }elseif (this.createTextRange) {

var range = this.createTextRange();

         range.collapse(true);

         range.moveEnd('character', end);

         range.moveStart('character', start);

         range.select();

      }

   });

};

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Object.prototype.toString.call([1,2,3]) === [object Array]   //true