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Expand file tree Collapse file tree Original file line number Diff line number Diff line change @@ -205,7 +205,8 @@ function (container, option) {
205205 // 浏览器对changedTouches的实现存在问题, 因此总是使用全量的touches进行比对
206206 function compareTouchFingers ( event ) {
207207 var identSet = { } ;
208- // 将不存在手指的添加到集合中
208+
209+ // 添加target内新出现的手指
209210 for ( var i = 0 ; i < event . originalEvent . targetTouches . length ; ++ i ) {
210211 var touch = event . originalEvent . targetTouches [ i ] ;
211212 identSet [ touch . identifier ] = true ;
@@ -214,10 +215,10 @@ function (container, option) {
214215 ++ fingerCount ;
215216 }
216217 }
217- // 将已删除的手指集合清理
218+ // 将target内消失的手指移除
218219 for ( var identifier in touchFingers ) {
219- // 浏览器集合中已不存在,删除
220- if ( identSet [ identifier ] === undefined ) {
220+ // 与本次touchevent属于同一个target,但是touchevent中已消失的手指,需要移除
221+ if ( identSet [ identifier ] === undefined && touchFingers [ identifier ] . target === event . originalEvent . target ) {
221222 delete ( touchFingers [ identifier ] ) ;
222223 -- fingerCount ;
223224 }
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