正则表达式过滤输入的表情符号

$(function(){
$("textarea").keyup(function(){
        var pattern = new RegExp('[^\u0020-\u007E\u00A0-\u00BE\u2E80-\uA4CF\uF900-\uFAFF\uFE30-\uFE4F\uFF00-\uFFEF\u0080-\u009F\u2000-\u201f
]');
        if ($(this).val() != "" && $(this).val() != null) {
            if (pattern.test($(this).val())) {
                var rs = "";
                for (var i = 0; i < $(this).val().length; i++) {
                    rs = rs + $(this).val().substr(i, 1).replace(pattern, '');
                }
                $(this).attr("value", rs);
            }
        }
    });
    $("textarea").blur(function(){
        var pattern = new RegExp('[^\u0020-\u007E\u00A0-\u00BE\u2E80-\uA4CF\uF900-\uFAFF\uFE30-\uFE4F\uFF00-\uFFEF\u0080-\u009F\u2000-\u201f
]');
        if ($(this).val() != "" && $(this).val() != null) {
            if (pattern.test($(this).val())) {
                var rs = "";
                for (var i = 0; i < $(this).val().length; i++) {
                    rs = rs + $(this).val().substr(i, 1).replace(pattern, '');
                }
                $(this).attr("value", rs);
            }
        }
    });
})