弹出打印窗口的一个方法

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<script defer>
function window.onload() {
factory.printing.header = "-"
factory.printing.footer = "-"
factory.printing.Print(true)
factory.printing.leftMargin = 0.2
factory.printing.topMargin = 0.5
factory.printing.rightMargin = 0.2
factory.printing.bottomMargin = 1.5
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