window.onload=function (){
let oDiv=document.getElementById('div1');
let str='sdfsf##dfasderferfef##dfdfsgdsgf##dgdfbfdghg';
oDiv.innerHTML=str.split(/##/g).map(item=>{
return `<p>${item}</p>`;
}).join('');
};
遇到##就换行
结果
sdfsf
dfasderferfef
dfdfsgdsgf
dgdfbfdghg
window.onload=function (){
let oDiv=document.getElementById('div1');
let str='sdfsf##dfasderferfef##dfdfsgdsgf##dgdfbfdghg';
oDiv.innerHTML=str.replace(/##/g, '<br/>')
};