first commit

历届学生/front-end-team-11/项目开发/上课项目/聊天室/fontend/js/utils/index.js

@@ -0,0 +1,110 @@
+class Utils {
+  query(name) {
+    var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)");
+    var r = window.location.search.substr(1).match(reg);
+    if (r != null)
+      return decodeURIComponent(r[2]);
+    return null;
+  }
+
+  setItem(key, value) {
+    localStorage.setItem(
+      key,
+      value.constructor == Object || value.constructor == Array
+        ? JSON.stringify(value)
+        : value
+    )
+  }
+
+  getItem(key) {
+    return localStorage.getItem(key) == null ? false : JSON.parse(localStorage.getItem(key))
+  }
+
+  initSocket() {
+    window.sc = io(config.socketBaseUrl);
+  }
+
+  timestamp() {
+    return new Date().getTime()
+  }
+
+  format(fmt, time) {
+    time = new Date(time)
+    var o = {
+      "M+": time.getMonth() + 1,                 //月份
+      "d+": time.getDate(),                    //日
+      "h+": time.getHours(),                   //小时
+      "m+": time.getMinutes(),                 //分
+      "s+": time.getSeconds(),                 //秒
+      "q+": Math.floor((time.getMonth() + 3) / 3), //季度
+      "S": time.getMilliseconds()             //毫秒
+    };
+
+    if (/(y+)/.test(fmt)) {
+      fmt = fmt.replace(RegExp.$1, (time.getFullYear() + "").substr(4 - RegExp.$1.length));
+    }
+
+    for (var k in o) {
+      if (new RegExp("(" + k + ")").test(fmt)) {
+        fmt = fmt.replace(
+          RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
+      }
+    }
+
+    return fmt;
+  }
+
+  async imgToBase64(url) {
+    var file = await getFileFromUrl(url);
+    var reader  = new FileReader();
+    return new Promise((resolve, reject) => {
+      reader.addEventListener("load", function () {
+        var base64gif = reader.result; 
+        resolve(base64gif)
+      }, false);
+
+      if (file) {
+        reader.readAsDataURL(file);
+      }
+    })
+
+    
+
+    
+  }
+
+  getFileFromUrl(url) {
+    let fileName = url.substr(url.lastIndexOf(".") -1 )
+    let type = url.match(/\.(\w+)$/)[1]
+    console.log(type);
+
+    return new Promise((resolve, reject) => {
+      var blob = null;
+      var xhr = new XMLHttpRequest();
+      xhr.open("GET", url);
+      xhr.setRequestHeader('Accept', `image/${type}`);
+      xhr.responseType = "blob";
+      // 加载时处理
+      xhr.onload = () => {
+        // 获取返回结果
+        blob = xhr.response;
+        let file = new File([blob], fileName, { type: `image/${type}` });
+        // 返回结果
+        resolve(file);
+      };
+      xhr.onerror = (e) => {
+        reject(e)
+      };
+      // 发送
+      xhr.send();
+    });
+  }
+}
+
+let {
+  query, setItem, getItem, initSocket, timestamp, format,
+  imgToBase64, getFileFromUrl
+} = new Utils()
+
+initSocket()
+