逐步完成前后端服务器

frontend/node_modules/echarts/lib/util/quickSelect.js

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+
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements.  See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership.  The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* "License"); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*   http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing,
+* software distributed under the License is distributed on an
+* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+* KIND, either express or implied.  See the License for the
+* specific language governing permissions and limitations
+* under the License.
+*/
+
+
+/**
+ * AUTO-GENERATED FILE. DO NOT MODIFY.
+ */
+
+/*
+* Licensed to the Apache Software Foundation (ASF) under one
+* or more contributor license agreements.  See the NOTICE file
+* distributed with this work for additional information
+* regarding copyright ownership.  The ASF licenses this file
+* to you under the Apache License, Version 2.0 (the
+* "License"); you may not use this file except in compliance
+* with the License.  You may obtain a copy of the License at
+*
+*   http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing,
+* software distributed under the License is distributed on an
+* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+* KIND, either express or implied.  See the License for the
+* specific language governing permissions and limitations
+* under the License.
+*/
+function defaultCompareFunc(a, b) {
+  return a - b;
+}
+function swapElement(arr, idx0, idx1) {
+  var tmp = arr[idx0];
+  arr[idx0] = arr[idx1];
+  arr[idx1] = tmp;
+}
+function select(arr, left, right, nth, compareFunc) {
+  var pivotIdx = left;
+  var pivotValue;
+  while (right > left) {
+    pivotIdx = Math.round((right + left) / 2);
+    pivotValue = arr[pivotIdx];
+    // Swap pivot to the end
+    swapElement(arr, pivotIdx, right);
+    pivotIdx = left;
+    for (var i = left; i <= right - 1; i++) {
+      if (compareFunc(pivotValue, arr[i]) >= 0) {
+        swapElement(arr, i, pivotIdx);
+        pivotIdx++;
+      }
+    }
+    swapElement(arr, right, pivotIdx);
+    if (pivotIdx === nth) {
+      return pivotIdx;
+    } else if (pivotIdx < nth) {
+      left = pivotIdx + 1;
+    } else {
+      right = pivotIdx - 1;
+    }
+  }
+  // Left == right
+  return left;
+}
+function quickSelect(arr, left, right, nth, compareFunc) {
+  if (arguments.length <= 3) {
+    nth = left;
+    if (arguments.length === 2) {
+      compareFunc = defaultCompareFunc;
+    } else {
+      compareFunc = right;
+    }
+    left = 0;
+    right = arr.length - 1;
+  }
+  return select(arr, left, right, nth, compareFunc);
+}
+export default quickSelect;