document.body.textContent//firefox浏览器
document.body.innerText//适用ie webkit浏览器
document.body.innerHTML.replace(/<(style|script|iframe)[^>]*?>[\s\S]+?<\/\1\s*>/gi,'').replace(/<[^>]+?>/g,'').replace(/\s+/g,' ').replace(/ /g,' ').replace(/>/g,' ');
repalceHtmlToText = (str) => {
str = str.replace(/<\/?.+?>/g, "");
str = str.replace(/ /g, "");
return str;
}