此代码中++符号的含义是什么:
for (var i=0; i < myString.length; i++) {
alert(myString[i]);
}
while (x>y) {
alert ("xrules!");
y++;
}
答案 0 :(得分:0)
这是increment运营商。这是(almost)相当于说i = i + 1
请注意,python中不存在增量运算符,您必须编写完整的东西或使用添加赋值运算符i += 1
请注意,有post(i++
)和pre(++i
)增量运算符,以及等效减量运算符--i
i--
。这些运算符在应用增量时有所不同,并且通常是新程序员感到沮丧的原因。
答案 1 :(得分:0)
++是增量运算符
说
y = y + 1
和说
是一回事<LinearLayout
android:id="@+id/layout_small_rectancle"
android:layout_width="match_parent"
android:layout_height="@dimen/drv3lite_small_rectangle_height"
android:baselineAligned="false"
android:layout_centerVertical="true"
android:orientation="horizontal" >
<!-- Small rectangles. Defines the whole width -->
<RelativeLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical" >
<!-- Small rectangle (left) -->
<RelativeLayout
android:layout_width="@dimen/drv3lite_small_rectangle_width"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/lblValueLTE"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textColor="@color/color_green"
android:textSize="@dimen/drv3lite_small_rectangle_text_size"
android:textStyle="bold"
android:text="1317"
android:enabled="true"
android:background="@drawable/selector_drv3lite_round_corners_lte"/>
<!-- Tag indicator -->
<TextView
android:id="@+id/lblTagLTE"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="start"
android:layout_marginLeft="5sp"
android:layout_marginStart="5sp"
android:textColor="@color/color_green"
android:textSize="18sp"
android:textStyle="bold"
android:text="T" />
<!-- Units -->
<TextView
android:id="@+id/lblUnitsLTE"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:gravity="end"
android:layout_marginRight="5sp"
android:layout_marginEnd="5sp"
android:textColor="@color/color_green"
android:textSize="18sp"
android:textStyle="bold"
android:text="µV/m" />
</RelativeLayout>
</RelativeLayout>
<!-- Small rectangles. Defines the whole width -->
<RelativeLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center" >
<!-- Small rectangle (right) -->
<RelativeLayout
android:layout_width="@dimen/drv3lite_small_rectangle_width"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/lblValueMid"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textColor="@color/color_orange"
android:textSize="@dimen/drv3lite_small_rectangle_text_size"
android:textStyle="bold"
android:text="145"
android:enabled="true"
android:background="@drawable/selector_drv3lite_round_corners_mid"/>
<!-- Tag indicator -->
<TextView
android:id="@+id/lblTagMid"
android:layout_width="30sp"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="start"
android:layout_marginLeft="5sp"
android:layout_marginStart="5sp"
android:textColor="@color/color_orange"
android:textSize="18sp"
android:textStyle="bold"
android:text="T" />
<!-- Units -->
<TextView
android:id="@+id/lblUnitsMid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true"
android:gravity="end"
android:layout_marginRight="5sp"
android:layout_marginEnd="5sp"
android:textColor="@color/color_orange"
android:textSize="18sp"
android:textStyle="bold"
android:text="µV/m" />
</RelativeLayout>
</RelativeLayout>
</LinearLayout>