提交初始版本，使用vant ui库

miniprogram_npm/@vant/weapp/picker/index.wxs

@@ -0,0 +1,42 @@
+/* eslint-disable */
+var style = require('../wxs/style.wxs');
+var addUnit = require('../wxs/add-unit.wxs');
+var array = require('../wxs/array.wxs');
+
+function columnsStyle(data) {
+  return style({
+    height: addUnit(data.itemHeight * data.visibleItemCount),
+  });
+}
+
+function maskStyle(data) {
+  return style({
+    'background-size':
+      '100% ' + addUnit((data.itemHeight * (data.visibleItemCount - 1)) / 2),
+  });
+}
+
+function frameStyle(data) {
+  return style({
+    height: addUnit(data.itemHeight),
+  });
+}
+
+function columns(columns) {
+  if (!array.isArray(columns)) {
+    return [];
+  }
+
+  if (columns.length && !columns[0].values) {
+    return [{ values: columns }];
+  }
+
+  return columns;
+}
+
+module.exports = {
+  columnsStyle: columnsStyle,
+  frameStyle: frameStyle,
+  maskStyle: maskStyle,
+  columns: columns,
+};