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每当表单值更改时,都会执行 showweeks 函数。它不应该只执行一次 onload 吗?

function showweeks() {

    if (document.forms["c_form"]["frequency"].value == "daily") {
        document.getElementById("c_dayint").style.backgroundColor = "#ffffff";
    } else {
        document.getElementById("c_dayint").style.backgroundColor = "#aaaaaa";
    }
    return;
}

window.onload = function() {

    showweeks();

    return;
};
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