/* var str="<body class='ss'>1111</body><b>3333，</b>";
var html=/<(.|\n)+?>/ig;
console.log(str.replace(html,"")); */
/*
var str="<body class='ss'>1111</body><b>3333，</b>";
var html=/(<(.|\n)+?>)/ig;
console.log(str.replace(html,"$1"));
*/
/* var str="<body class='ss'>11可有可无sfsdfsd11</body><b>3333，</b>";
var html=/(<body(.|\n)+?>)/ig;
console.log(str.replace(html,"$1 <img src='xxxx'/>"));
*/
var str="<body class='ss'>11可有可无sfsdfsd11</body><b>3333，</b>";
var html=/(<body(.|\n)+?)>/ig;
console.log(str.replace(html,"$1 onclick='test()'>"))
https://codepen.io/jianyeruan/pen/pwxbEd
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