https://codepen.io/bSwastik6/pen/QWQgYPO?editors=1010
JAVASCRIPT 代碼存在一些我無法解決的問題。如果你們檢查代碼中的錯誤，將會很有幫助。
錯誤：{未捕獲的型別錯誤：無法設定 null 的屬性（設定“innerHTML”）}
// Variables
var tenspart = 0;
var minpart = 0;
var secpart = 0;
var time;
// Node Selector
var start = document.querySelector(".start");
var stop = document.querySelector(".stop");
var reset = document.querySelector(".reset");
var tenth = document.querySelector(".tens");
var minute = document.querySelector(".min");
var second = document.querySelector(".second");
// Add Event Listener
start.addEventListener("click", () => {
clearInterval(time);
time = setInterval(watchCounter, 10);
});
stop.addEventListener("click", () => {
clearInterval(time);
});
reset.addEventListener("click", () => {
clearInterval(time);
tenspart = 0;
minpart = 0;
secpart = 0;
tenth.innerHTML = "0" tenspart;
second.innerHTML = "0" secpart;
minute.innerHTML = "0" minpart;
});
// Event Function
var watchCounter = function () {
tenspart ;
tenth.innerHTML = tenspart;
if (tenspart < 9) {
tenth.innerHTML = "0" tenspart;
}
if (tenspart > 99) {
secpart ;
second.innerHTML = secpart;
if (secpart < 9) {
second.innerHTML = "0" secpart;
}
tenspart = 0;
}
if (secpart > 59) {
minpart ;
minute.innerHTML = minpart;
if (minpart < 9) {
minute.innerHTML = "0" minpart;
}
secpart = 0;
}
};
uj5u.com熱心網友回復：
秒 div 的類名是“sec”，但您在 JavaScript 中定位“.second”。
轉載請註明出處，本文鏈接：https://www.uj5u.com/gongcheng/479283.html
標籤：javascript html css 网络
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