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function getRandomStr(){
return Math.round((1000 - 1 + 1 ) * Math.random() + 1);
}
var arr = new Array();
for(var i=0;i<5000;i++){
arr.push({a:getRandomStr()});
}
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// ¿ìËÙÅÅÐò;
function SortObject1(arr){
// ¼Ç¼Êý×é×îºóÐèÒª±éÀúµÄλÖÃ
var leavings = arr.length;

// ×¼±¸½»»»¶ÔÏñÓõÄÁÙʱ±äÁ¿;
var p1 = arr[0],p=0,tmp;

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while(leavings != 0){
// ѰÕÒÊý×éÖÐ×î´óµÄÖµ
for(var i=0;i < leavings;i++){
if(arr[i].a > p1.a){
p1 = arr[i];
p = i;
}
}
//ÒÆ¶¯×î´óÊý¾Ý¶ÔÏñµ½¶Óβ;
leavings--;
tmp = arr[p];
arr[p] = arr[leavings];
arr[leavings] = tmp;
p1=arr[0],p=0;

}
}
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function SortObject2(arr){
var leavings_e = arr.length;
var leavings_s = 1
var p_max = arr[0],p_max_l=0,tmp;
var p_min = arr[0],p_min_l=0,tmp;
while(leavings_e > leavings_s){
for(var i=leavings_s;i<leavings_e;i++){
if(arr[i].a > p_max.a){
p_max = arr[i];
p_max_l = i;
}
if(arr[i].a < p_min.a){
p_min = arr[i];
p_min_l = i;
}


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var Stack=function(limt_length){
this.stack=new Array();
this.limt=(limt_length)?limt_length:8;
}
Stack.prototype.push=function(o){
 if(this.exist(o)){
  this.remove(o);
  this.stack.unshift(o);
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