使用jq重繪img大小+測試密碼的強度+滾動時動態加載頁面內容+導航菜單切換

1、使用jq重繪img大小

$(window).bind("load", function() {
     // IMAGE RESIZE
     $('#product_cat_list img').each(function() {
          var maxWidth = 120;
          var maxHeight = 120;
          var ratio = 0;
          var width = $(this).width();
          var height = $(this).height();

          if(width > maxWidth){
           ratio = maxWidth / width;
           $(this).css("width", maxWidth);
           $(this).css("height", height * ratio);
           height = height * ratio;
          }
          var width = $(this).width();
          var height = $(this).height();
          if(height > maxHeight){
           ratio = maxHeight / height;
           $(this).css("height", maxHeight);
           $(this).css("width", width * ratio);
           width = width * ratio;
          }
     });
     //$("#contentpage img").show();
     // IMAGE RESIZE
});

2、測試密碼的強度

<input type="password" name="pass" id="pass" /> 
<span id="passstrength"></span>

//下面的正則表達式建議各位收藏哦，項目上有可能會用得着
$('#pass').keyup(function(e) {
      //密碼爲八位及以上並且字母數字特殊字符三項都包括
     var strongRegex = new RegExp("^(?=.{8,})(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])(?=.*\\W).*$", "g");

  //密碼爲七位及以上並且字母、數字、特殊字符三項中有兩項，強度是中等 
     var mediumRegex = new RegExp("^(?=.{7,})(((?=.*[A-Z])(?=.*[a-z]))|((?=.*[A-Z])(?=.*[0-9]))|((?=.*[a-z])(?=.*[0-9]))).*$", "g");
     var enoughRegex = new RegExp("(?=.{6,}).*", "g");
     if (false == enoughRegex.test($(this).val())) {
             $('#passstrength').html('More Characters');
     } else if (strongRegex.test($(this).val())) {
             $('#passstrength').className = 'ok';
             $('#passstrength').html('Strong!');
     } else if (mediumRegex.test($(this).val())) {
             $('#passstrength').className = 'alert';
             $('#passstrength').html('Medium!');
     } else {
             $('#passstrength').className = 'error';
             $('#passstrength').html('Weak!');
     }
     return true;
});

3、滾動時動態加載頁面內容

var loading = false;
$(window).scroll(function(){
 if((($(window).scrollTop()+$(window).height())+250)>=$(document).height()){
      if(loading == false){
           loading = true;
           $('#loadingbar').css("display","block");
           $.get("load.php?start="+$('#loaded_max').val(), function(loaded){
                $('body').append(loaded);
                $('#loaded_max').val(parseInt($('#loaded_max').val())+50);
                $('#loadingbar').css("display","none");
                loading = false;
           });
      }
 }
});

$(document).ready(function() {
 $('#loaded_max').val(50);
});

4、導航菜單背景切換效果

<ul id='nav'>
    <li>導航一</li>
    <li>導航二</li>
    <li>導航三</li>
</ul>

//注意：代碼需要修飾完善
$('#nav').click(function(e) {
  // 要知道siblings的使用
$(e.target).addClass('tclass').siblings('.tclass').removeClass('tclass');;
    });