放到层里面，再设层的透明度。

查了一下allowTransparency，帖出来，希望对大家有用

ALLOWTRANSPARENCY Attribute | allowTransparency Property Internet Development Index

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Sets or retrieves whether the object can be transparent.

Syntax

HTML
Scripting object.allowTransparency(v) [ = bClear ]

Possible values

bClear Boolean that specifies or receives one of the following values.false Default. Object is opaque. It cannot be transparent.
true Object can be transparent.


The property is read/write. The property has a default value of false.

Expressions can be used in place of the preceding value(s), as of Microsoft® Internet Explorer 5. For more information, see About Dynamic Properties.

Remarks

When the property is set to false, the backgroundColor property of the object can only be that of the window. When the property is set to true, the backgroundColor property of the object can be set to any value, including the default value of transparent.

Example

The following example shows four ways to use the allowTransparency attribute, with and without the background-color attribute. Because the allowTransparency attribute of Frame1 is set to true, Frame1 renders red, the background color of the parent document. The allowTransparency attribute of Frame2 is also set to true, however the background-color attribute of Frame2 is set to green, so Frame2 renders green. Because the allowTransparency attribute of Frame3 is set to false (the default value), Frame3 renders white, the color of the t:SRC document. The allowTransparency attribute of Frame4 is also set to false, so Frame4 renders white even though the background-color attribute of Frame4 is set to green.

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Standards Information

This property is a Microsoft extension to HTML

hmily在上个帖子中说

引用:

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放到层里面，再设层的透明度。

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层的透明度由CSS控制吗？

alpha

Alpha滤镜可以对物体设置一定的透明度，既可以是一个图像，也可以是一个块级区域。
STYLE="filter:Alpha(Opacity=opacity, FinishOpacity=finishopacity, Style=style, StartX=startX, StartY=startY, FinishX=finishX, FinishY=finishY)"
Opacity
透明度级别,范围是0-100, 0代表完全透明 is transparent, 100代表完全不透明.
FinishOpacity
透明区域结束时的透明度级别，从0-100, 0代表完全透明, 100代表完全不透明。
Style
代表透明区域的形状特征，可设置的值是0（统一形状），1（线性），2（矩形），3（长方形）。
StartX
代表透明效果开始时的x坐标X.
StartY
代表透明效果开始时的x坐标Y.
FinishX
代表透明效果结束时的x坐标X.
FinishY
代表透明效果结束时的x坐标Y.

我试着这样



但字也透明了

谢谢！这不会影响速度吧!!