js输出内容到新网页（预览）
myWindow=window.open('','','width=200,height=100')
myWindow.document.write("This is 'myWindow'")
myWindow.focus()
myWindow.opener.document.write("This is the parent window") 
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myWindow=window.open('','','width=200,height=100')
myWindow.document.write("This is 'myWindow'")
myWindow.focus()
myWindow.opener.document.write("This is the parent window") 