houoop

ko.extenders.paging = function (target, pageSize) {
    var _pageSize = ko.observable(pageSize || 10), // default pageSize to 10
        _currentPage = ko.observable(1); // default current page to 1

    target.pageSize = ko.computed({
        read: _pageSize,
        write: function (newValue) {
            if (newValue > 0) {
                _pageSize(newValue);
            }

houoop

ko.observableArray.fn.filterByProperty = function(propName, matchValue) {
    return ko.computed(function() {
        var allItems = this(), matchingItems = [];
        for (var i = 0; i < allItems.length; i++) {
            var current = allItems[i];
            if (ko.utils.unwrapObservable(current[propName]) === matchValue)
                matchingItems.push(current);
        }
        return matchingItems;
    }, this);

houoop

var match = ko.utils.arrayFirst(self.dialogboxArray(), function(item) {
                return newMessage.target === item.name;
            });

houoop

if (!/\.(gif|jpg|jpeg|png|GIF|JPG|PNG)$/.test(ths.value)) {  
            alert("你选择的不是图片文件");  
            ths.value = "";  
            return false;  
}