setTimeout(), clearTimeout()
今天学了setTimeout(), clearTimeout() ,想到可以做一个计时器。先给自己马一下
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>计时器</title> 6 <script> 7 8 var num =0; 9 var i; 10 function startCount(){ 11 //文本框的值赋给num 12 document.getElementById('count').value =num; 13 num += 1; 14 i =setTimeout("startCount()",1000); 15 } 16 17 function stopCount(){ 18 clearTimeout(i); 19 } 20 </script> 21 22 23 </head> 24 <body> 25 <input type="text" id="count"/> 26 <input type="button" value="继续" onclick="startCount()"/> 27 <input type="button" value="暂停" onclick="stopCount()"> 28 29 </body> 30 </html>
有一点就是,刚开始进去必须点一下继续才开始计时,研究一下看看怎么解决吧。
还可以做购物车添加物件,数量增加的效果:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>购物车效果</title> <script> var num =1; function startCount(){ //文本框的值赋给num document.getElementById('count').value =num; num += 1; setTimeout("startCount()",1000); } </script> </head> <body> <input type="text" id="count"/> <input type="button" value="添加" onclick="startCount()"/> </body> </html>