Javascript 多参数敲除JS中的扩展器
可以在knockout.js中使用多个参数吗 示例:Javascript 多参数敲除JS中的扩展器,javascript,knockout.js,Javascript,Knockout.js,可以在knockout.js中使用多个参数吗 示例: ko.extenders.currency = function(target, currencySymbol, position) { var result = ko.computed({ read: target, write: function(newValue) { var current = target(), if (position ==
ko.extenders.currency = function(target, currencySymbol, position) {
var result = ko.computed({
read: target,
write: function(newValue) {
var current = target(),
if (position == 'left') {
target(currencySymbol+target);
} else {
target(target+currencySymbol);
}
}
}).extend({ notify: 'always' });
但是,我如何将它与可观察的联系起来呢
this.One = ko.observable(one).extend({ currency: ???, currencySymbol: '£', position : 'left'});
您需要为此使用对象,例如:
ko.extenders.currency = function(target, options) {
var currencySymbol = options.symbol,
position = options.position;
var result = ko.computed({
read: target,
write: function(newValue) {
var current = target(),
if (position == 'left') {
target(currencySymbol+target);
} else {
target(target+currencySymbol);
}
}
}).extend({ notify: 'always' });
然后,你会这样称呼它:
this.One = ko.observable(one).extend({ currency: { symbol: '£', position : 'left' } });
或者,如果您更喜欢可读性更强的代码:
var currencyOptions = { symbol: '£', position: 'left' };
this.One = ko.observable(one).extend({ currency: currencyOptions });