扩展String方法示例

Posted 2021-02-27

Simple extension of the string method using string.prototype.

function fmtHeading(level) {
	stringtext = this.toString();
	starttag = "<h" + level + ">";
	endtag = "</h" + level + ">";	
	return starttag + stringtext + endtag;
}
 
String.prototype.heading = fmtHeading;
document.write("This is a heading!".heading(2));