| 70 | |
| 71 | // Fire callbacks// 触发回调函数列表 |
| 72 | fire = function(data) { |
| 73 | //如果参数memory为true，则记录data |
| 74 | memory = options.memory && data; |
| 75 | fired = true; //标记触发回调 |
| 76 | firingIndex = firingStart || 0; |
| 77 | firingStart = 0; |
| 78 | firingLength = list.length; |
| 79 | //标记正在触发回调 |
| 80 | firing = true; |
| 81 | for (; list && firingIndex < firingLength; firingIndex++) { |
| 82 | if (list[firingIndex].apply(data[0], data[1]) === false && options.stopOnFalse) { |
| 83 | // 阻止未来可能由于add所产生的回调 |
| 84 | memory = false; // To prevent further calls using add |
| 85 | break; //由于参数stopOnFalse为true，所以当有回调函数返回值为false时退出循环 |
| 86 | } |
| 87 | } |
| 88 | //标记回调结束 |
| 89 | firing = false; |
| 90 | if (list) { |
| 91 | if (stack) { |
| 92 | if (stack.length) { |
| 93 | //从堆栈头部取出，递归fire |
| 94 | fire(stack.shift()); |
| 95 | } |
| 96 | } else if (memory) { //否则，如果有记忆 |
| 97 | list = []; |
| 98 | } else { //再否则阻止回调列表中的回调 |
| 99 | self.disable(); |
| 100 | } |
| 101 | } |
| 102 | }, |
| 103 | // Actual Callbacks object |
| 104 | // 暴露在外的Callbacks对象,对外接口 |
| 105 | self = { |