javascript - Please tell me about this js case in w3c. I use window.onload to write how to count from 0 after clicking the end button and then clicking the start button.

Question

{Code...} This is what I learned to write by myself. What is the problem? After clicking to end, the original number is counted. I hope that when I click to start again, it starts from 0.

滿天的星座 · Answer

obtn2.onclick = function() {
                a = 0;    //需要重新重置开始数字
                document.getElementById('txt').value=0; 
                clearTimeout(x);
                }
            }

怪我咯 · Answer

Click to end and reload the page!

给我你的怀抱 · Answer

window.onload=function(){
var a = 0;

        obtn1 = document.getElementById("btn1");
        obtn2 = document.getElementById("btn2");
        txt=document.getElementById('txt');
        obtn1.onclick=function(){
        txt.value=++a;
        }
        obtn2.onclick=function(){
        a=0;
        txt.value=a;
        }

}

PHP中文网 · Answer

Just put var a = 0; in the obtn1.onclick function and declare it

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