js highlight words function, support chinese

hilight_keywords.js

'use strict';

function convertKeywordsToRegStr(keywords) {
    return '(' + keywords.trim().replace(/[^\w\u4E00-\u9FA5]+/g, '|') + ')';
}

function getHighlightFn(keywords, highlightClass) {
    var regexpStr = convertKeywordsToRegStr(keywords);
    if (regexpStr.length === 2) {
        return function (sourceText) {
            return sourceText;
        };
    }

    var regexp = new RegExp(regexpStr, 'ig');
    var replaceTo = '<span class="' + highlightClass + '">$1</span>';

    return function (sourceText) {
        return sourceText.replace(regexp, replaceTo);
    };
}

var fn = getHighlightFn('测试 中国', 'hl');
console.log(fn('abc'));//abc
console.log(fn('我要测试下'));//我要<span class="hl">测试</span>下
console.log(fn('我要测试下，中国啊啊'));//我要<span class="hl">测试</span>下，<span class="hl">中国</span>啊啊