我用一条我不理解的行继承了一些代码.
function updateQty () {
obj.find('.inputAmount').html(qty);
input.val(qty);
$.each(change_actions,function() {
this(qty);
});
}
.each函数中究竟发生了什么？我以前从未见过这种(var)这种方式.
解决方法
作者使用绑定设置他们自己的事件,因此change_actions很可能是订阅在数量发生某些事情时运行的函数.
尝试这样的事情：
// initialize with a value
var actions = [
function(x){ console.log('I see a new x: ' + x); }
];
// add actions "later"
actions.push(function(x){ console.log('Yup,a new x: ' + x); });
// Then execute them:
$.each(actions,function(){
this(4);
});
// add another one still
actions.push(function(x){ console.log(x + ' looks new'); });
// re-iterate over them
// Then execute them:
$.each(actions,function(){
this(5);
});
结果：
// first iteration (only 2 subscribed events) [15:56:50.030] "I see a new x: 4" [15:56:50.030] "Yup,a new x: 4" // second iteration (now we have 3,one was added later) [15:56:50.030] "I see a new x: 5" [15:56:50.030] "Yup,a new x: 5" [15:56:50.030] "5 looks new" // <-- new subscription
把它想象成click事件以及如何通过绑定到$(‘element’)来添加订阅.单击().每次发生点击时,都会触发任何订阅的事件.
