设置默认横向打印以及纸张大小

报表预览或打印时默认是纵向的A4纸张大小，运行时可以通过“页面设置”修改纸张、边距、方向等

如果要修改默认的纸张、边距、方向等可以通过代码的方式在页面的“初次渲染完成”事件实现，具体如下：

react:

onPageReady = (event) => {
        let report = this.comp("reportui0");
        let config = report.state._config;
        config.page.height = "364mm";
        config.page.width = "257mm";
        config.page.paperType = "B4"; //设置纸张类型
        config.page.pageWidth = "257mm"; //设置纸张宽度
        config.page.pageHeight = "364mm"; //设置纸张高度
        config.page.marginLeft = "3.7mm";//设置纸张左边距
        config.page.marginRight = "3.7mm";//设置纸张右边距
        config.page.marginTop = "2.4mm";//设置纸张上边距
        config.page.marginBottom = "2.4mm";//设置纸张下边距
}

vue：

let onPageReady = (event) => {
    let report = $page.comp("reportui0");
    let config = report.state._config;
    config.page.orientation="Landscape"; //设置为横向
    config.page.height = "364mm";
    config.page.width = "257mm";
    config.page.paperType = "B4"; //设置纸张类型
    config.page.pageWidth = "257mm"; //设置纸张宽度
    config.page.pageHeight = "364mm"; //设置纸张高度
    config.page.marginLeft = "3.7mm";//设置纸张左边距
    config.page.marginRight = "3.7mm";//设置纸张右边距
    config.page.marginTop = "2.4mm";//设置纸张上边距
    config.page.marginBottom = "2.4mm";//设置纸张下边距
}