Baseline Widely available
FileReader
ã® readyState
ããããã£ã¯ã FileReader
ãããèªã¿åãæä½ã®ç¾å¨ã®ç¶æ
ãæä¾ãã¾ãã FileReader
ã¯ä»¥ä¸ã®ããããã®ç¶æ
ã«ããã¾ãã
0
EMPTY
Reader ã使ããã¾ãããã¾ã èªã¿è¾¼ã¾ãã¦ããã¡ã½ããã¯ããã¾ããã 1
LOADING
read ã¡ã½ãããå¼ã³åºããã¾ããã 2
DONE
æä½ãå®äºãã¦ãã¾ãã
EMPTY
FileReader
ã¯ä½æããã¾ãããã readAs ã¡ã½ããã¯ã¾ã å¼ã³åºããã¦ãã¾ããã
LOADING
readAs ã¡ã½ãããå¼ã³åºããã¾ããã File
ã¾ã㯠Blob
ãèªã¿åãä¸ã§ãããã¾ã ã¨ã©ã¼ã¯çºçãã¦ãã¾ããã
DONE
èªã¿åãæä½ãå®äºãã¦ãã¾ããããã¯ã File
ã¾ã㯠Blob
ã®å
¨ä½ãã¡ã¢ãªã¼ã«èªã¿è¾¼ã¾ãããããã¡ã¤ã«èªã¿åãã¨ã©ã¼ãçºçãããã abort()
ãå¼ã³åºãããèªã¿åãããã£ã³ã»ã«ããããããããããæå³ãã¾ãã
const reader = new FileReader();
console.log("EMPTY", reader.readyState); // readyState 㯠0 ã«ãªãã¾ãã
reader.readAsText(blob);
console.log("LOADING", reader.readyState); // readyState 㯠1 ã«ãªãã¾ãã
reader.onloadend = () => {
console.log("DONE", reader.readyState); // readyState 㯠2 ã«ãªãã¾ãã
};
å¤
FileReader
API ã®ããã«å®ç¾©ããã¦ãããç¶æ
ã表ã 3 ã¤ã®å®æ°ã®ãã¡ã® 1 ã¤ã§ãã
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