按范例操作，提示obj:null

Jun 12, 2022 8:49:34 AM

error FunctionExpr NoSuchMethodException-- obj:null item:write

error FunctionExpr NoSuchMethodException-- obj:null item:read

var file = new File('/sdcard/my.txt');
file.write('hello');
console.log('read ret:' + file.read());

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