添加常用的js代码

常用信息.md

@@ -17,3 +17,105 @@
 ```javascript
 const userInfo = JSON.parse(localStorage.getItem("theme-account"))
 ```
+
+**获取url参数**
+> 维护人员： youHong.ai
+
+```javascript
+getQueryString = (name) => {
+    let reg = new RegExp("(^|&|\/?)" + name + "=([^&]*)(&|$)", "i");
+    let searchStr = window.location.href
+    if (searchStr.startsWith('&')) {
+        searchStr = searchStr.substr(1)
+    }
+    search = searchStr.match(reg)
+    if (search != null) {
+        return unescape(search[2]);
+    }
+    return null;
+}
+
+```
+
+**ajax请求**
+> 维护人员： youHong.ai
+
+```javascript
+  class ApiUtils {
+    static request = (url, type = "GET", data, isAsync = true, success = () => {
+    }, error = () => {
+    }, complete = () => {
+    }, contentType = 'application/json', beforeSend = () => {
+    }) => {
+        let options = {
+            url,
+            type,
+            dataType: "json",
+            contentType,
+            async: isAsync,
+            data,
+            beforeSend,
+            success,
+            error,
+            complete,
+        }
+        if (contentType == 'application/json') {
+            options.data = JSON.stringify(data)
+        }
+        return $.ajax(options)
+    }
+
+}
+```
+
+**通过js获取react组件，操作组件内部数据**
+
+```javascript
+function FindReact(dom, traverseUp = 0) {
+    const key = Object.keys(dom).find(key => {
+        return key.startsWith("__reactFiber$") // react 17+
+            || key.startsWith("__reactInternalInstance$"); // react <17
+    });
+    const domFiber = dom[key];
+    if (domFiber == null) return null;
+
+    // react <16
+    if (domFiber._currentElement) {
+        let compFiber = domFiber._currentElement._owner;
+        for (let i = 0; i < traverseUp; i++) {
+            compFiber = compFiber._currentElement._owner;
+        }
+        return compFiber._instance;
+    }
+
+    // react 16+
+    const GetCompFiber = fiber => {
+        let parentFiber = fiber.return;
+        while (typeof parentFiber.type == "string") {
+            parentFiber = parentFiber.return;
+        }
+        return parentFiber;
+    };
+    let compFiber = GetCompFiber(domFiber);
+    for (let i = 0; i < traverseUp; i++) {
+        compFiber = GetCompFiber(compFiber);
+    }
+    return compFiber.stateNode;
+}
+
+// 用法
+const someElement = document.getElementById("someElement");
+const myComp = FindReact(someElement);
+myComp.setState({test1: test2});
+```
+
+### 数据库
+
+**备份mysql数据库**
+> 维护人员： youHong.ai
+
+```shell
+mysqldump -uroot -p'passowrd' --single-transaction -R -E --databases ecology_dev> /tmp/ecology_dev_back.sql
+```
+
+### 后端