js Html结构转字符串形式显示代码

//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;
}