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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> | |
| <title>server-mock使用说明</title> | |
| <style> | |
| body { | |
| background: #eee; | |
| } | |
| .container{ | |
| width: 900px; | |
| margin: 0 auto; | |
| background: white; | |
| text-align: center; | |
| } | |
| button { | |
| width: 100px; | |
| background-color: seagreen; | |
| } | |
| ul { | |
| text-align: left; | |
| } | |
| li { | |
| padding: 10px 10px; | |
| margin:10px 10px; | |
| background: lightblue; | |
| border: 1px solid maroon; | |
| border-radius: 5px; | |
| } | |
| li:hover { | |
| background: yellowgreen; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| 加载更多demo | |
| <br> | |
| <ul> | |
| </ul> | |
| <button>loadMore</button> | |
| </div> | |
| <script src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script> | |
| <script> | |
| var btn = $('button')[0] | |
| var ul = $('ul')[0] | |
| var ajaxFuc = function(opts) { | |
| var xhr = new XMLHttpRequest() | |
| xhr.onreadystatechange = function() { | |
| if(xhr.readyState == 4 && (xhr.status >= 200 && xhr.status < 300 || xhr.status == 304)) { | |
| var result = JSON.parse(xhr.responseText) | |
| console.log("。。。到服务器了。。。") | |
| console.log(result) | |
| opts.success(result) | |
| }else { | |
| console.log("错误；") | |
| // opts.error(xhr.status + ": " + xhr.statusText) | |
| } | |
| } | |
| // console.log(opts.url) | |
| // xhr.open('get', opts.url, true) | |
| // xhr.send() | |
| switch (opts.metherd.toLowerCase()) { | |
| case 'get': | |
| xhr.open('get', opts.url, true) | |
| xhr.send(null) | |
| break; | |
| case 'post': | |
| xhr.open('post', opts.url, true) | |
| xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded') | |
| xhr.send(data) | |
| break; | |
| default: | |
| return | |
| } | |
| } | |
| var flag = false | |
| var index = 0 | |
| btn.addEventListener('click', function(){ | |
| this.innerText = 'loading ...' | |
| if(flag) { return } | |
| ajaxFuc({ | |
| metherd: 'get', | |
| url: '/loadMore?index=' + index, | |
| success: function(result) { | |
| btn.innerText = 'loadMore' | |
| index += 5 | |
| console.log(result) | |
| var fregment = document.createDocumentFragment() | |
| for(var i=0; i < 5; i++) { | |
| var node = document.createElement('li') | |
| node.innerText = result[i] | |
| fregment.appendChild(node) | |
| } | |
| ul.appendChild(fregment) | |
| }, | |
| error: function(msg) { | |
| // console.log(msg) | |
| btn.innerText = 'loadMore' | |
| } | |
| }) | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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| /** | |
| * 发送 GET 请求, 有参数 | |
| * GET /loadMore?index=0 | |
| * 默认一次性返回5个数据 | |
| */ | |
| app.get('/loadMore', function(req, res) { | |
| var data = [] | |
| var index = req.query.index | |
| for(var i=0; i < 5; i++) { | |
| data.push(Number(index) + i) | |
| } | |
| res.send(data) | |
| }); |
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loadMore：
ajax + jQuery