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1. Ó¦ÓàArray.prototype.joinʵÏÖ×Ö·ûºÏ²¢
·½·¨1.
String.prototype.times = function(n) {
    return Array.prototype.join.call({length:n+1}, this);
};
"js".times(5)   // => "jsjsjsjsjs"
·½·¨2.
 var ArrayTest=new Array("HE","LL","O");
 var hello = Array.prototype.join.call(ArrayTest, '|');
 alert(hello);   // => "HE|LL|O");
 
2.×Ö·û´®·Ö¸î³ÉÊý×é
var  _param = "HE||LL||O"; 
var  _paramArray = _param.split("|");
    alert(_paramArray.length)