javascript权威指南——笔记（第十章：正则）

 1     var str = "12 f13kjm54n43 43k";
 2     var arr = [];
 3 
 4     for(var i = 0, len = str.length; i<len; i++){
 5 
 6         var char = str.charAt(i);
 7 
 8         if(char >= "0" && char <= "9"){
 9             arr.push(char);
10         }
11 
12     }
13     console.log(arr);

1     var str = "12 f13kjm54n43 43k";
2     var re = /\d/g;
3     var reArr = [];
4     reArr = str.match(re);
5 
6     console.log(reArr);

 1     var str = "12 f13kjm54n43fdf545655656 43k 323456";
 2     var arr = [];
 3     var tmp = "";
 4 
 5     for(var i = 0, len = str.length; i<len; i++){
 6         var char = str.charAt(i);
 7         if(char >= "0" && char <= "9"){
 8             tmp += char;
 9         }else{
10             if(tmp){
11                 arr.push(tmp);
12             }
13             tmp = "";
14         }
15     }
16 
17     if(tmp){
18         arr.push(tmp);
19     }
20 
21     console.log(arr);

1     var str = "12 f13kjm54n43fdf545655656 43k 323456";
2     var reArr = [];
3     var re = /\d+/g;
4     reArr = str.match(re);
5     
6     console.log(reArr);