寫入文件

document.getElementById("but1").onclick = function(){
    plus.io.requestFileSystem(plus.io.PRIVATE_DOC,function(fs){
        fs.root.getFile("fanya/fy"+".json",
            {create:true},
            function(fileEntry){
            fileEntry.file(function(file){
            
                fileEntry.createWriter(
                    function(writer){
                        writer.write(JSON.stringify([{id:100,url:'baidu.url'},{id:250,url:'baidu.url'}]));
                });
            });
        })
    })
}

讀取文件

document.getElementById("but2").onclick = function(){
    plus.io.resolveLocalFileSystemURL( "/storage/emulated/0/Android/data/io.dcloud.HBuilder/apps/HBuilder/doc/fanya/fy.json", function( entry ) {
        entry.file( function(file){
            var fileReader = new plus.io.FileReader();
            fileReader.readAsText(file, 'utf-8');
            fileReader.onloadend = function(evt) {
                var arr = JSON.parse(evt.target.result),str = "";
                for(var i = 0; i<arr.length;i++){
                    str+=`
                        <li>id:${arr[i].id}; url:${arr[i].url}</li>
                    `
                }
                document.getElementById("box").innerHTML = str;
            }
        } );
    });
}