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String.prototype.trim = function() {
var reExtraSpace = /^\s+(.*?)\s+$/;
return this.replace(reExtraSpace,"$1");
}
 
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var sTest = " this is a test ";
alert("[" + sTest + "]"); //outputs " [ this is a test ] "
alert("[" + sTest.trim() + "]"); outputs " [this is a test] " 
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{
    for(var i in properties){(function(which){
    var p=i;
    //´´½¨´ËÊôÐÔµÄÒ»¸öеĶÁÈ¡Æ÷(getter)
    which["get"+p] = function(){
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