js循环数组各种方法array 汇总-基础

js循环数组各种方法array 汇总-基础  
   
  

   这几天做系统， 又用到多维数组 循环 交叉。所以总结一套 以供参考记录
  
  

   
  
 
1. var myStringArray = ["Hello","World"];
2. for (var
3. alert(myStringArray[i]);
4. //Do something
5. }


 
1. Array.prototype.foo = "foo!";
2. var array = ['a', 'b', 'c'];
3. 
4. for (var i in
5. alert(array[i]);
6. }
7. 
8. for(var i in this.$GLOBAL_DETAIL.album_photo_ids){if(this.$GLOBAL_DETAIL.album_photo_ids[i] == "3487675024077108") alert(this.$GLOBAL_DETAIL.album_photo_ids[i]);}


 
1. [1,2,3,4].map( function(item) {
2. alert(item);
3. })


 
1. var x = [1,2,3,4].map( function(item) { return
2. 
3. // And now x is [10,20,30,40]


 
1. var myStringArray = [ "Hello", "World"
2. var
3. for (var
4. if (i in
5. var
6. do something with
7. }
8. }


 
1. var myStringArray = [ "Hello", "World"
2. myStringArray.forEach( function(s) {
3. do something with
4. } )


 
1. var i=0,item,items = ['one','two','three'];
2. while(item=items[i++]){
3. console.log(item);
4. }
5. 
6. // logs: 'one','two','three'
7. 
8. and for
9. var items = ['one','two','three'], i=items.length;
10. while(i--){
11. console.log(items[i]);
12. }
13. 
14. // logs: 'three','two','one'
15. 
16. or the classical for
17. var items = ['one','two','three']
18. for(var
19. console.log(items[i]);
20. }
21. 
22. // logs: 'one','two','three'


 
1. var myStringArray = ['Hello', 'World']; // array uses [] not {}
2. for (var i in
3. ' -> ' + myStringArray[i]); // i is the index/key, not the item
4. }
5. 
6. 
7. 
8. 
9. 
10. 11. web前端入坑系列：点击标题进入