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历届学生/font-end-nine/项目练习/学生项目/郑若怡/案例练习/6-18作业/刷新页面.html

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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+    <link rel="stylesheet" href="http:///at.alicdn.com/t/font_3445167_ub2ivnoluaa.css">
+    <style>
+        body {
+            margin: 0;
+            padding: 0;
+            width: 100%;
+            height: 1000px;
+        }
+
+        .iconfont {
+            font-size: 50px;
+            position: absolute;
+            top: 0px;
+        }
+
+        .header {
+            width: 100%;
+            height: 50px;
+            background: red;
+            overflow: hidden;
+            position: relative;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+        }
+    </style>
+</head>
+
+<body>
+    <div class="header">
+        <i class="iconfont icon-shuaxin"></i>
+    </div>
+</body>
+<script>
+    var header = $(".header");
+    var content = $("content");
+    var startY = 0;
+
+    $("body").onscroll = function (v) {
+        if (document.documentElement.scrollTop == 0) {
+            //绑定下拉事件
+            v.addEventListener('touchstart', function (e) {
+                startY = e.targetTouches[0].screenY;
+                console.log("startY:", startY);
+                console.log("touchstart:", e);
+            })
+
+            v.addEventListener('touchmove', function (e) {
+                var moveY = e.targetTouches[0].screenY;
+                console.log("moveY:", moveY);
+                // 下滑
+                if (startY > moveY) {
+                    console.log("下滑：",);
+                } else {
+                    console.log("上滑");
+                }
+            })
+
+            v.addEventListener('touchend', function (e) {
+                console.log("touchend:", e);
+                var endY = e.changedTouches[0].screenY;
+            })
+            console.log("到顶了:", header);
+        } else {
+            // header.className = "header"
+        }
+
+    }
+
+
+
+
+
+    function $(className) {
+        return document.querySelector(className)
+    }
+</script>
+
+</html>