做到这一点 -
1)你必须把所有的文档变量里面的window.onload
window.onload = function() {
var formEntry = document.getElementById('formEntry');
var formButton = document.getElementById('formButton');
};
2)你必须改变formEntry被点击的formButton时,这样就把.value的另一个函数内部改变,像这样
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')'不会被加载。使用[浏览器控制台(开发工具)](https://webmasters.stackexchange.com/q/8525)(点击'F12')并读取任何错误。 – Xufox