ajax点击加载更多数据图片（预加载）

时间：2022-12-22 20:58:44
 1 <!DOCTYPE html>
 2 <html>
 3     <head>
 4         <meta charset="UTF-8">
 5         <title>ajax点击加载更多数据--博客园--勇淘未来</title>
 6         <script type="text/javascript" src="jquery-1.11.1.min.js"></script>
 7         <style>
 8             *{padding:0;margin:0;}
 9             .box {margin: 100px auto;width: 550px;}
10             ul li {width:550px;list-style: none;}
11             ul li span{text-align:center;display:block;}
12             .clear {clear: both;}
13             .load {text-align: center;display: none;margin-top:50px;color:#ccc;}
14             .end{display:none;color:#ccc;}
15         </style>
16     </head>
17     <body>
18         <div class="box">
19             <ul></ul>
20             <div class="clear"></div>
21             <div class="load">加载中...</div>
22             <div class="more" style="text-align: center;margin-top:50px;">
23                 <button class="btn">查看更多图片</button>
24                 <div class="end">没有更多了</div>
25             </div>
26         </div>
27         <script>
28             var num = 0;
29             var start = 0;
30             var size = 2;
31             $.ajax({
32                 url: "dataNews.json",
33                 type: "get",
34                 success: function(res){
35                     var str = "";
36                     for(var i = 0;i < 2;i++){
37                         str += "<li><img src=" + res[i].img + "><span>"+ res[i].title +"</span></li>";
38                     }
39                     $(".box ul").append(str);
40                 },
41                 error:function(){
42                     console.log(errors);
43                 }
44             })
45             $(".btn").click(function(){
46                 $(".load").show();
47                 setTimeout(function(){
48                     $(".load").hide();
49                     num++;
50                     console.log(num);
51                     start = num * size;
52                     $.ajax({
53                         url:"dataNews.json",
54                         type:"get",
55                         success:function(res){
56                             var sum = res.length;
57                             if(start + size > sum) {
58                                 size = sum - start;
59                                 $(".btn").css("display","none");
60                                 $(".end").css("display","block");
61                             }
62                             var str = "";
63                             for(var i = start;i<(start + size);i++) {
64                                 str += "<li><img src=" + res[i].img + "><span>"+ res[i].title +"</span></li>";
65                             }
66                             console.log(start + size);
67                             $("ul").append(str);
68                         }
69                     });
70                 },300)
71             }
72         )
73         </script>
74 </body>
75 </html>

本地测试dataNews.json文件:

[ {
	"img":"img/sina.jpg","title":"百度音乐1"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐2"
}
, {
	"img":"img/sina.jpg","title":"百度音乐3"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐4"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐5"
}
, {
	"img":"img/sina.jpg","title":"百度音乐6"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐7"
}
, {
	"img":"img/sina.jpg","title":"百度音乐8"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐9"
}
, {
	"img":"img/sina.jpg","title":"百度音乐10"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐11"
}
, {
	"img":"img/sina.jpg","title":"百度音乐12"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐13"
}
, {
	"img":"img/sina.jpg","title":"百度音乐14"
}
, {
	"img":"img/tengxu.jpg","title":"百度音乐15"
}
]

点击更多图片，加载2条数据，当数据加载完了，就显示 “没有更多了”

欢迎大家留言评论

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