JS实现计算字符串字节长度

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JS计算字符串字节长度

String.prototype.byteLength = function() {
	var count = 0;
	for(var i=0,l=this.length;i<l;i++) {
		count += this.charCodeAt(i) <= 128 ? 1 : 2;
	}
	return count;
}

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