如何使用JS脚本从HTML中分离图片标签与文本，替换文本中指定的内容并加粗（原创）

var html=‘ddfsdfsdfdsd dfsdfsdffds<img _src="http://localhost:8490/60E86EA7-FE7B-44BF-8270-4DF2036B2118.PNG" data-latex="x=\frac {-b\pm \sqrt {{b}^{2}-4ac}} {2a}" src="http://localhost:8490/60E86EA7-FE7B-44BF-8270-4DF2036B2118.PNG" class="kfformula">dfsdfsrewewrererew  ds<img _src="http://localhost:8490/60E86EA7-FE7B-44BF-8270-4DF2036B2118.PNG" data-latex="x=\frac {-b\pm \sqrt {{b}^{2}-4ac}} {2a}" src="http://localhost:8490/60E86EA7-FE7B-44BF-8270-4DF2036B2118.PNG" class="kfformula">dfsdfsdfsddfs<img _src="http://localhost:849060E86EA7-FE7B-44BF-8270-4DF2036B2118.PNG" data-latex="x=\frac {-b\pm \sqrt {{b}^{2}-4ac}} {2a}" src="http://localhost:8490/60E86EA7-FE7B-44BF-8270-4DF2036B2118.PNG" class="kfformula">ddfdsdfd<img _src="http://localhost:849060E86EA7-FE7B-44BF-8270-4DF2036B2118.PNG" data-latex="x=\frac {-b\pm \sqrt {{b}^{2}-4ac}} {2a}" src="http://localhost:8490/60E86EA7-FE7B-44BF-8270-4DF2036B2118.PNG" class="kfformula">dkjdfskjfdskl‘;

String.prototype.replaceAll = function(s1,s2){
　　return this.replace(new RegExp(s1,"gm"),s2);
}

var appendHtml="";
var keyword="s";

var partArray=html.split("<");
$.each(partArray,function(key,value){  
   //console.log("value="+value+";key="+key); 
   var secPartArray=value.split(‘>‘);
  $.each(secPartArray,function(key1,value1){
    if(value1.indexOf("img")==0)
    {
      appendHtml+="<"+value1+">";     
    }
    else
    {
      appendHtml+=value1.replaceAll(keyword,"<strong>"+value1+"</strong>");
    }
   console.log(value1);
  });
});
console.log(appendHtml);