計算字串所佔的 bytes

Posted by: 邱小新 at 下午3:54:00
function byteLength(str) { // returns the byte length of an utf8 string var s = str.length; for (var i=str.length-1; i>=0; i--) { var code = str.charCodeAt(i); if (code > 0x7f && code <= 0x7ff) s++; else if (code > 0x7ff && code <= 0xffff) s+=2; if (code >= 0xDC00 && code <= 0xDFFF) i--; //trail surrogate } return s; } 來源: String length in bytes in JavaScript
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