显然我并不完全理解 Angular 的 ng-show 指令是如何与 $scope 交互的。当数组为空时，我试图隐藏一个元素。我的html如下：
<h1>Tabs</h1>
<ul ng-hide="tabs.length == 0">
<li ng-repeat="t in tabs">
<img src="{{t.thumbnailurl}}" />
</li>
</ul>
标签是这样的：
Array
0: Object
$$hashKey: "01H"
created: "2013-08-20 20:15:00"
thumbnailurl: "https://s3.amazonaws.com/xxxxx"
__proto__: Object
1: Object
$$hashKey: "01J"
created: "2012-07-09 23:26:49"
thumbnailurl: "https://s3.amazonaws.com/xxxxx"
__proto__: Object
length: 2
__proto__: Array[0]
当我加载我的页面时，ng-hide 在控制台中抛出以下异常，说明匿名函数没有方法“trim”。显然 Angular 在内部的某个地方呕吐。
TypeError: Object function () {
// If the string looks like an identifier, then we can return it as is.
// If the string contains no control characters, no quote characters, and no
// backslash characters, then we can simply slap some quotes around it.
// Otherwise we must also replace the offending characters with safe
// sequences.
if (ix.test(this)) {
return this;
}
if (/[&<"\/\\\x00-\x1f]/.test(this)) {
return '"' + this.replace(/[&<"\/\\\x00-\x1f]/g, function (a) {
var c = escapes[a];
if (c) {
return c;
}
c = a.charCodeAt();
return '\\u00' +
Math.floor(c / 16).toString(16) +
(c % 16).toString(16);
}) + '"';
}
return '"' + this + '"';
} has no method 'trim'
at watchFnToHumanReadableString (http://b.gro/campaigns#/tabs/23402:706:30)
at Object.$delegate.__proto__.$watch (http://b.gro/campaigns#/tabs/23402:735:28)
at http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js:13829:9
at nodeLinkFn (http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js:4406:13)
at compositeLinkFn (http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js:4015:15)
at publicLinkFn (http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js:3920:30)
at <error: illegal access>
at Object.Scope.$broadcast (http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js:8307:28)
at http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js:7463:26
at wrappedCallback (http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js:6846:59) <ul ng-hide="tabs.length == 0" class="ng-scope"> angular.js:5754
根据 ng-hide/show 文档，该指令应该非常直接，并接受传递给它的真/假语句。我只是不确定我在这里做错了什么......