Created
November 26, 2012 04:45
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localStorage with ByteArray
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| <!DOCTYPE html><html><head><meta charset="utf-8"> | |
| <script> | |
| window.onload = function() { | |
| // localStorage に対するバイナリ文字列のデータ読み書きテスト | |
| // MobileSafari, AndroidBrowserでは、電源OFF -> ON でデータが消失する | |
| if (0) { | |
| // null(0x00) を含まない文字列データ | |
| if (!localStorage.getItem("dummy")) { | |
| localStorage.setItem("dummy", "dummy"); | |
| alert("write data"); | |
| location.reload(true); // force reload | |
| return; | |
| } | |
| alert(localStorage.getItem("dummy")); | |
| return; | |
| } | |
| if (1) { | |
| // null(0x00) を含むバイナリ文字列データ | |
| if (!localStorage.getItem("test")) { | |
| // key "test" から値が取得できない場合は、 | |
| // localStorageに書き込み、ページを強制リロードします | |
| var byteString = | |
| String.fromCharCode(0x00,0x01,0x32,0x33, // "\0\123" | |
| 0x00,0x01,0x32,0x3042); // "\0\12あ" | |
| localStorage.setItem("test", byteString); | |
| alert("write data"); // 再度ここを通る場合はデータが壊れている | |
| location.reload(true); // force reload | |
| return; | |
| } | |
| // key "test" が存在する場合は取得し、値の妥当性をチェックします | |
| var resultByteString = localStorage.getItem("test"); | |
| alert("result: " + resultByteString); | |
| var ready = true; | |
| if (resultByteString.charCodeAt(0) !== 0x00 || | |
| resultByteString.charCodeAt(1) !== 0x01 || | |
| resultByteString.charCodeAt(2) !== 0x32 || | |
| resultByteString.charCodeAt(3) !== 0x33 || | |
| resultByteString.charCodeAt(4) !== 0x00 || | |
| resultByteString.charCodeAt(5) !== 0x01 || | |
| resultByteString.charCodeAt(6) !== 0x32 || | |
| resultByteString.charCodeAt(7) !== 0x3042){ | |
| ready = false; | |
| } | |
| alert("localStorage with ByteString: " + (ready ? "READY" | |
| : "NOT READY")); | |
| if (ready) { | |
| alert(resultByteString); | |
| } | |
| } | |
| }; | |
| </script> | |
| </head><body> | |
| </body></html> |
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ByteArray といいつつ、バイナリ文字列ですけども