如何在有条件的情况下增加或减少AS3中的显示数字变量? [英] How to raise or decrease a display number variable in AS3 with a condition?
问题描述
在Toolbar.as类中,我在动态文本框中显示了一个简单的变量(4位数字),如下所示:
I've got, in my Toolbar.as class, a simple variable (4-digit number) displayed in a dynamic text box, like that :
var number = 9999;
useText.text = String(number);
trace(number);
在我的拼图班中,我有一个条件,如果是真的,我想减少这个数字. 我怎样才能做到这一点 ?
In my puzzle class I have a condition and I would like to decrease the number if it's true. How can I do that ?
例如,我在我的Puzzle.as类中:
For exemple, I've got, in my Puzzle.as class :
if (inv.containsItem("rock")) {
toolbar.useText.text = "String(number)" - 100;
}
但是它不起作用(我知道我必须更改"String(number)"-100,但是我应该放什么?
But it doesn't work (I know that I have to change the "String(number)" - 100 but what should I put ?
谢谢!
推荐答案
我相信您正在尝试这样做:String(number - 100);
I believe you are attempting to do: String(number - 100);
这称为包装器或强制转换,您正在使用-100的操作将数字变量强制转换为String
.
The is called a wrapper or casting, you are casting the number variable with the operation of - 100 to a String
.
如果您想获取字段中的当前文本并使用它:
If you want to grab the current text in your field and use that:
useText.text = String( Number( useText.text ) - 100 );
这会将当前文本转换为Number
,减去100,然后将其转换回String
This casts the current text to a Number
, subtracts 100, then casts it back to a String
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