javascript - 在 JavaScript 中用下划线替换空格？

Question

我正在尝试使用此代码将空格替换为 _，它适用于字符串中的第一个空格，但所有其他空格实例保持不变。有人知道为什么吗？

function updateKey()
{
    var key=$("#title").val();
    key=key.replace(" ","_");
    $("#url_key").val(key);
}

Answer 1

试试.replace(//g,"_");

编辑:或 .split(' ').join('_') 如果你厌恶 REs

编辑:John Resig said :

If you're searching and replacing through a string with a static search and a static replace it's faster to perform the action with .split("match").join("replace") - which seems counter-intuitive but it manages to work that way in most modern browsers. (There are changes going in place to grossly improve the performance of .replace(/match/g, "replace") in the next version of Firefox - so the previous statement won't be the case for long.)