Js bỏ dấu tiếng việt

function stringToSlug(str) {
// remove accents
var from = "àáãảạăằắẳẵặâầấẩẫậèéẻẽẹêềếểễệđùúủũụưừứửữựòóỏõọôồốổỗộơờớởỡợìíỉĩịäëïîöüûñçýỳỹỵỷ",
to = "aaaaaaaaaaaaaaaaaeeeeeeeeeeeduuuuuuuuuuuoooooooooooooooooiiiiiaeiiouuncyyyyy";
for (var i = 0, l = from.length; i < l; i++) {
str = str.replace(RegExp(from[i], "gi"), to[i]);
}

str = str.toLowerCase()
.trim()
.replace(/[^a-z0-9\-]/g, '-')
.replace(/-+/g, '-');

return str;
}