encodeURIComponent will work. (You may or may not want the leading '?', depending on what the script is expecting.)
var c= 'd e'
var query= '?a=b&c='+encodeURIComponent(c);
var uri= 'http://www.example.com/script?query='+encodeURIComponent(query);
window.location= uri;
Takes me to:
When you hover over that it may appear once-decoded in the browser's status bar, but you will end up in the right place.
escape/unescape() is the wrong thing for encoding query parameters, it gets Unicode characters and pluses wrong. There is almost never a case where escape() is what you really need.
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