常用js代码整理、收集

 1 <input type="text" name="word" value=‘请输入关键字‘ style="color:#ccc;" />
 2 <script>
 3 /*
 4 *清除输入框默然提示文字
 5 */ 
 6 jQuery.focusblur = function(focusid,focusColor,blurColor) {
 7     var focusblurid = $(focusid);
 8     var defval = focusblurid.val();
 9     focusblurid.focus(function(){
10         var thisval = $(this).val();
11         if(thisval==defval){
12             $(this).val("");
13             $(this).css("color",focusColor);
14         }
15     });
16     focusblurid.blur(function(){
17         var thisval = $(this).val();
18         if(thisval==""){
19             $(this).val(defval);
20             $(this).css("color",blurColor);
21         }else{
22             $(this).css("color",focusColor);
23         }
24     });
25     
26 };
27 
28 $(document).ready(function(){
29     //清除name=‘world‘的input里的默认提示文字
30     $.focusblur("[name=‘word‘]","#333","#ccc");
31 
32 })
33 </script>

 1 <!-- 返回顶部 -->
 2 <style>
 3 #gotop{display:none; width:80px; height:30px; line-height:30px; text-align:center; border:1px solid #dedede; background-color:#f8f8f8; cursor:pointer;
 4         position:fixed; bottom:40px; right:20px; z-index:99999;
 5 }
 6 </style>
 7 <div id="gotop">gotop</div>
 8 <script type=‘text/javascript‘>
 9   var backTop=function (btnId){
10         var btn=document.getElementById(btnId);
11         var d=document.documentElement;
12         var b=document.body;
13         window.onscroll=set;
14         btn.onclick=function (){
15             btn.style.display="none";
16             window.onscroll=null;
17             this.timer=setInterval(function(){
18                 d.scrollTop-=Math.ceil((d.scrollTop+b.scrollTop)*0.1);
19                 b.scrollTop-=Math.ceil((d.scrollTop+b.scrollTop)*0.1);
20                 if((d.scrollTop+b.scrollTop)==0) clearInterval(btn.timer,window.onscroll=set);
21             },10);
22         };
23         function set(){btn.style.display=(d.scrollTop+b.scrollTop>800)?‘block‘:"none"} //滚动的高度大于800px时才显示
24     };
25     backTop(‘gotop‘);
26 </script>
27 <!-- 返回顶部END -->

 1 /*
 2 *去除数组里的重复项
 3 */
 4 function uniQueue(array){ 
 5   var arr=[]; 
 6   var m; 
 7   while(array.length>0){ 
 8       m=array[0]; 
 9       arr.push(m); 
10       array=$.grep(array,function(n,i){ 
11       return n==m; 
12       },true); 
13   } 
14   return arr; 
15 }
16 var testArr=[3,3,2,1,5,5];
17 alert(testArr);                //[3,3,2,1,5,5]
18 alert(uniQueue(testArr));    //[3,2,1,5]

 1 /*
 2 * 冒泡排序
 3 */
 4 function bubbleSort(arg){
 5     return bubbleSortTemp(arg.arr,
 6                    arg.order || "asc");
 7 }
 8 function bubbleSortTemp(arr,order){
 9     if(!(arr instanceof Array)) return false;         
10     if(order=="asc"){          //asc:升序
11         for(var i=0;i<arr.length;i++){
12             for(var j=i+1;j<arr.length;j++){
13                 if(arr[i]>arr[j]){
14                     var temp=arr[i];
15                     arr[i]=arr[j];
16                     arr[j]=temp;
17                 }
18             }
19         }
20         return arr;
21     }else if(order=="desc"){   //desc:降序
22         for(var i=0;i<arr.length;i++){
23             for(var j=i+1;j<arr.length;j++){
24                 if(arr[i]<arr[j]){
25                     var temp=arr[i];
26                     arr[i]=arr[j];
27                     arr[j]=temp;
28                 }
29             }
30         }
31         return arr;
32     }else{
33         return false;
34     }
35 }
36 //具体例子如下
37 var testArr=[2,4,5,1,3,6,8,7];
38 alert(testArr);                                //[2,4,5,1,3,6,8,7]
39 alert(bubbleSort({arr:testArr,order:"desc"})); //[8,7,6,5,4,3,2,1]
40 alert(bubbleSort({arr:testArr,order:"asc"}));  //[1,2,3,4,5,6,7,8]
41 alert(bubbleSort({arr:testArr}));               //[1,2,3,4,5,6,7,8]

 1 /*
 2 *把冒泡排序封装成prototype原型对象函数
 3 */
 4 Array.prototype.asc=function(){ //升序排序
 5     for(var i=0;i<this.length;i++){
 6         for(var j=i+1;j<this.length;j++){
 7            if(this[i]>this[j]){
 8               var temp=this[i];
 9               this[i]=this[j];
10               this[j]=temp;
11             }
12         }
13     }
14     return this;
15 }
16 Array.prototype.desc=function(){//降序排序
17     for(var i=0;i<this.length;i++){
18         for(var j=i+1;j<this.length;j++){
19            if(this[i]<this[j]){
20               var temp=this[i];
21               this[i]=this[j];
22               this[j]=temp;
23             }
24         }
25     }
26     return this;
27 }
28 //具体例子如下
29 var testArr=[2,4,5,1,3,6,8,7];
30 alert(testArr.asc());  //[1,2,3,4,5,6,7,8]
31 alert(testArr.desc()); //[8,7,6,5,4,3,2,1]

 1  if (navigator.appName == ‘Microsoft Internet Explorer‘) {   //让ie支持getElementsByClassName方法
 2         document.getElementsByClassName = function() {   
 3             var tTagName = "*";   
 4             if (arguments.length > 1) {   
 5                 tTagName = arguments[1];   
 6             }   
 7             if (arguments.length > 2) {   
 8                 var pObj = arguments[2]   
 9             } else {   
10                 var pObj = document;   
11             }   
12             var objArr = pObj.getElementsByTagName(tTagName);   
13             var tRObj = new Array();   
14             for ( var i = 0; i < objArr.length; i++) {   
15                 if (objArr[i].className == arguments[0]) {   
16                     tRObj.push(objArr[i]);   
17                 }   
18             }   
19             return tRObj;   
20         }   
21  }