20/10/10 11:13:56.06 WDGTv5mn.net
ポリフィルなんて知らなかったよ、ありがとう。
// URLﾘﾝｸ(github.com)
// URLﾘﾝｸ(developer.mozilla.org)
if (!String.prototype.padStart) {
String.prototype.padStart = function padStart(targetLength, padString) {
targetLength = targetLength >> 0; //truncate if number, or convert non-number to 0;
padString = String(typeof padString !== 'undefined' ? padString : ' ');
if (this.length >= targetLength) {
return String(this);
} else {
targetLength = targetLength - this.length;
if (targetLength > padString.length) {
padString += padString.repeat(targetLength / padString.length); //append to original to ensure we are longer than needed
}
return padString.slice(0, targetLength) + String(this);
}
};
}