js html转义

//Html结构转字符串形式显示 支持<br>换行
function ToHtmlString(htmlStr) {
    return toTXT(htmlStr).replace(/\&lt\;br[\&ensp\;|\&emsp\;]*[\/]?\&gt\;|\r\n|\n/g, "<br/>");
}
//Html结构转字符串形式显示
function toTXT(str) {
    var RexStr = /\<|\>|\"|\'|\&|　| /g
    str = str.replace(RexStr,
    function (MatchStr) {
        switch (MatchStr) {
            case "<":
                return "&lt;";
                break;
            case ">":
                return "&gt;";
                break;
            case "\"":
                return "&quot;";
                break;
            case "'":
                return "&#39;";
                break;
            case "&":
                return "&amp;";
                break;
            case " ":
                return "&ensp;";
                break;
            case "　":
                return "&emsp;";
                break;
            default:
                break;
        }
    }
    )
    return str;
}