做到這一點 -
1)你必須把所有的文檔變量裏面的window.onload
window.onload = function() {
var formEntry = document.getElementById('formEntry');
var formButton = document.getElementById('formButton');
};
2)你必須改變formEntry被點擊的formButton時,這樣就把.value的另一個函數內部改變,像這樣
window.onload = function() {
var formEntry = document.getElementById('formEntry');
var formButton = document.getElementById('formButton');
formButton.addEventListener('click', function() {
formEntry.value = "foo";
});
};
或替代地
window.onload = function() {
document.getElementById('formButton').addEventListener('click', function() {
document.getElementById('formEntry').value = "foo";
});
};
'document.getElementById('formButton')'不會被加載。使用[瀏覽器控制檯(開發工具)](https://webmasters.stackexchange.com/q/8525)(點擊'F12')並讀取任何錯誤。 – Xufox