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// 2018.5.11更新: 减少了swap
function qSort(compare) {
var swap = (p1, p2) => {
var tmp = this[p1];
this[p1] = this[p2];
this[p2] = tmp;
}
var sortRange = (start, end) => {
var midValue = this[start];
var p1 = start + 1, p2 = end - 1;