替换所有html代码的特殊字符

  // 翻转替换里面所有的html代码的尖括弧
  function replaceRevertAllHTML(txt){
   var value  =  txt
   var leftCarr = /</g ;
   var rightCarr =/>/g ;
   var dan = /'/g;
   var and = /&/g;
   var shuang = /"/g;
    value =   value.replace(leftCarr, "<");
    value =   value.replace(rightCarr, ">");
    value =   value.replace(shuang, "\"");
    value =   value.replace(dan, "\'"); 
    value =   value.replace(and, "&"); 
   return value;
  }