QML在获取错误前检查文件/镜像是否存在

import QtQuick 2.0
import QtQuick.Controls 2.0
import Qt.labs.folderlistmodel 2.1

Item {
    property string filePath: "path/to/file.txt"

    Button {
        text: "Check File Existence"
        onClicked: {
            var file = new File(filePath)
            if (file.exists()) {
                console.log("File exists.")
            } else {
                console.log("File does not exist.")
            }
        }
    }
}

import QtQuick 2.0
import QtQuick.Controls 2.0

Item {
    property string imagePath: "path/to/image.png"

    Image {
        source: imagePath
        asynchronous: true
        onStatusChanged: {
            if (status === Image.Error) {
                console.log("Image does not exist.")
            } else if (status === Image.Ready) {
                console.log("Image exists.")
            }
        }
    }
}