Javascript Angularjs过滤器错误："；错误：未知提供程序：textProvider"；

我为我的angularjs项目创建了一个自定义过滤器，类似于下面的fiddle

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我做错了什么

如果您查看该jsFiddle中的代码，该filter函数将返回一个以

text

etc作为参数的函数。应该是这样的：

myapp.filter('truncate',function(){
    return function(text, length) {
        var end = "..."
        text = text.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
        if (isNaN(length))
         length = 23;



        if (text.length <= length || text.length - end.length <= length) {
            return text;
        }
        else {
            return String(text).substring(0, length-end.length) + end;
        }
    }
});

myapp.filter('truncate', function(myService) {
    if (myService.someCondition()) {
        return function(text, length) {
            // return the text as usual
        }
    } else {
        return function(text, length) {
            // return the text and do some other things as well
        }
    }
});

var myapp = angular.module('myapp', ['ngResource']);

myapp.filter('truncate',function(){
    return function(text, length) {
        var end = "..."
        text = text.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
        if (isNaN(length))
         length = 23;



        if (text.length <= length || text.length - end.length <= length) {
            return text;
        }
        else {
            return String(text).substring(0, length-end.length) + end;
        }
    }
});

myapp.filter('truncate', function(myService) {
    if (myService.someCondition()) {
        return function(text, length) {
            // return the text as usual
        }
    } else {
        return function(text, length) {
            // return the text and do some other things as well
        }
    }
});