helponfocus.js

来自「jsf与JavaScript结合的范例。让你轻松学会网络编程。」· JavaScript 代码 · 共 12 行

function setInnerHTML(id, content) {
    document.getElementById(id).innerHTML = content;
}
    
function showHelpOnFocus(msg) {
    setInnerHTML("helpOnFocus", msg);
}

function clearHelpOnBlur() {
    setInnerHTML("helpOnFocus", "");
}