html代码执行

2019-10-28 00:17:56 -0700
编辑下面的代码:【加编码】
结果: 【此窗口】帮助？
 <script src="/static/ace/ace.js"></script>
<script>
var editor = ace.edit("textareaCode");
editor.setFontSize(15);
editor.setTheme("ace/theme/xcode");
editor.getSession().setMode("ace/mode/html");

function submitTryit() {
document.getElementById("code").value=editor.getValue();
document.getElementById("tryitform").action="/demo/?x=" + Math.random();
validateForm();
document.getElementById("iframeResult").contentWindow.name = "view";
document.getElementById("tryitform").submit();
}

function addCharset() {
    var t=editor.getValue();
    var code = '<meta charset="utf-8">';
    if (t.indexOf(code) == -1){
      if (t.indexOf('<head>') > -1) {
        t = t.replace('<head>','<head>\n'+code);
      } else if (t.indexOf('<html>') > -1) {
        t = t.replace('<html>','<html>\n<head>\n'+code+'\n</head>');
      } else if (t.indexOf('<body>') > -1) {
        t = '<html>\n<head>\n'+code+'\n</head>\n' + t + '</html>';
      } else {
        t = '<html>\n<head>\n'+code+'\n</head>\n<body>\n'+t+'\n</body>\n</html>';
      }
      editor.setValue(t);
      editor.gotoLine(3);
    }
}

function change_form_target() {
  var tryitform = document.getElementById("tryitform");
  var form_target = document.getElementById("form_target");

  if (tryitform.target == 'view') {
    tryitform.target = "_target";
    form_target.innerHTML = '【新窗口】';
  }
  else {
    tryitform.target = "view";
    form_target.innerHTML = '【此窗口】';
  }
}

function validateForm() {
var code=document.getElementById("code").value;
if (code.length>20000) {
    document.getElementById("code").value="<h1>提交的代码太长！</h1>";
    }
}
submitTryit();
</script>
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