扫码枪工具类

utils/scan.js

+export default class scan {
+  static Page(page) {
+    ['onShow', 'onHide', 'onUnload'].forEach((f) => {
+      const raw = page[f];
+      var code = '';
+      var isScaning = false;
+      page[f] = (...args) => {
+        if (f === 'onShow') {
+          if (!page._keyEventListener) {
+            my.ix.onKeyEventChange(page._keyEventListener = (r) => {
+              let cur = getCurrentPages().slice(-1)[0];
+              if (cur && cur.onKeyPress){
+
+                if (isScaning == false) {
+                  isScaning = true
+                  code = (r.keyCode - 7)+''
+                  setTimeout(() => {
+                     cur.onKeyPress.call(cur, code);
+                     isScaning = false
+                  }, 500);
+                }else{
+                  //特殊处理  keycode需要减7
+                   code = code + (r.keyCode - 7)
+                } 
+            
+              }
+            });
+          }
+        } else if (f === 'onHide' || f === 'onUnload') {
+          if (page._keyEventListener) {
+            my.ix.offKeyEventChange(page._keyEventListener);
+            page._keyEventListener = null;
+          }
+        }
+        if (raw instanceof Function) {
+          let cur = getCurrentPages().slice(-1)[0];
+          raw.call(cur, ...args);
+        }
+      };
+    });
+    return Page(page);
+  }
+}
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