在客户端使用chrome浏览器中的javascript创建文件

window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem;

 window.requestFileSystem(window.TEMPORARY, 1024*1024, function(fs) {    fs.root.getFile('test.bin', {create: true}, function(fileEntry) { // test.bin is filename        fileEntry.createWriter(function(fileWriter) { var arr = new Uint8Array(3); // data length arr[0] = 97; // byte data; these are pres for 'abc' arr[1] = 98; arr[2] = 99; var blob = new Blob([arr]); fileWriter.addEventListener("writeend", function() {     // navigate to file, will download     location.href = fileEntry.toURL(); }, false); fileWriter.write(blob);        }, function() {});    }, function() {});}, function() {});