Javascript高亮关键字，不区分大小写

本代码支持多字符匹配，以空格为分割

function HighLight(nWord) {
         if (nWord != '') {
                 var keyword = document.body.createTextRange();
                 while (keyword.findText(nWord)) {
                        keyword.pasteHTML( "<span style='color:red;'>" + keyword.text + "</span>");
                        keyword.moveStart('character', 1);
                }
        }
}
// 高亮关键字
function highword(nWord) {

         var array = nWord.replace(/(^\s*)|(\s*$)/g, "");
        array = array.split( " ");
         for ( var i = 0; i < array.length; i++) {
                HighLight(array[i]);
        }
        document.getElementById( "footdiv").style.display = "";
}