Javascript detect Chinese Character

Here is the function to detect Chinese Chracters. However, we need do more research about CJK (Chinese, Japanese, Korean) about the unicode character range.

function isChineseCharacter(str) {

    var re1 = new RegExp("^[\u4E00-\uFA29]*$"); //Chinese character range
    var re2 = new RegExp("^[\uE7C7-\uE7F3]*$"); //non Chinese character range
    str = str.replace(/\s/g, '');

    if (!re1.test(str) || re2.test(str)) {
        console.log("Oops, Please input Chinese character.");
        return false;
    }

    console.log('Chinese character');
    return true;
}