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Circle.prototype.pi = Math.PI;
function ACirclesArea () {
    return this.pi * this.r * this.r; // ¼ÆËãÔ²Ãæ»ýµÄ¹«Ê½Îª ?r2¡£
}
Circle.prototype.area = ACirclesArea; // ¼ÆËãÔ²Ãæ»ýµÄº¯ÊýÏÖÔÚÊÇ Circle Prototype ¶ÔÏóµÄÒ»¸ö·½·¨¡£
var a = ACircle.area();               // ´ËΪÈçºÎÔÚ Circle ¶ÔÏóÉϵ÷ÓÃÃæ»ýº¯Êý¡£
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// Ôö¼ÓÒ»¸öÃûΪ trim µÄº¯Êý×÷Ϊ
// String ¹¹Ô캯ÊýµÄÔ­ÐͶÔÏóµÄÒ»¸ö·½·¨¡£
String.prototype.trim = function()
{
    // ÓÃÕýÔò±í´ïʽ½«Ç°ºó¿Õ¸ñ
    // ÓÿÕ×Ö·û´®Ìæ´ú¡£
    return this.replace(/(^\s*)|(\s*$)/g, "");
}
 
// ÓпոñµÄ×Ö·û´®
var s = "    leading and trailing spaces    ";
 
// ÏÔʾ "    leading and trailing spaces     (35)"
window.alert(s + " (" + s.length + ")");
 
// ɾ³ýǰºó¿Õ¸ñ
s = s.trim();
// ÏÔʾ"leading and trailing spaces (27)"
window.alert(s + " (" + s.length + ")");
 
 


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