我正在玩这个
fiddle中的指令和绑定.我收到以下错误：
- Uncaught Error: 10 $digest() iterations reached. Aborting!
- Watchers fired in the last 5 iterations: [["fn: function () {\n var parentValue = parentGet(parentScope);\n\n if (parentValue !== scope[scopeName]) {\n // we are out of sync and need to copy\n if (parentValue !== lastValue) {\n // parent changed and it has precedence\n lastValue = scope[scopeName] = parentValue;\n } else {\n // if the parent can be assigned then do so\n parentSet(parentScope,lastValue = scope[scopeName]);\n }\n }\n return parentValue;\n }; newVal: {\"baz\":3}; oldVal: {\"baz\":3}"],["fn: function () {\n var parentValue = parentGet(parentScope);\n\n if (parentValue !== scope[scopeName]) {\n // we are out of sync and need to copy\n if (parentValue !== lastValue) {\n // parent changed and it has precedence\n lastValue = scope[scopeName] = parentValue;\n } else {\n // if the parent can be assigned then do so\n parentSet(parentScope,lastValue = scope[scopeName]);\n }\n }\n return parentValue;\n }; newVal: {\"baz\":3}; oldVal: {\"baz\":3}"]] angular.js:7729
- Scope.$digest angular.js:7729
- Scope.$apply angular.js:7894
- (anonymous function) angular.js:930
- invoke angular.js:2788
- bootstrap angular.js:928
- angularInit angular.js:904
- (anonymous function) angular.js:14397
- trigger angular.js:1695
- (anonymous function) angular.js:1930
- forEach angular.js:110
- eventHandler angular.js:1929
为什么会发生这种情况？我认为它与=绑定有关.
这是因为它是在每次通过摘要循环时创建一个全新的对象.手表注册在这个=数据绑定中,因此每次评估bar =“{baz：3}”时,都会创建一个新对象,因此它将与先前的值不同,并且会导致另一个摘要循环.最终它会中止,使它不会无限循环.见
http://docs.angularjs.org/guide/concepts#runtime更全面的解释.
诀窍是使用不会随时更改的引用来执行= databing.这通常是通过将其放在指令之外的范围内完成的.见http://jsfiddle.net/u4BTu/7/
