常用HTML要求 JavaScript脚本_html javascript open other page-优快云博客

本文链接：https://blog.youkuaiyun.com/qffhq/article/details/5514633

特殊JavaScript脚本：

1.禁用(恢复)href超级链接．

2.javascript中调用vbs对话框实现Confirm,可以显示Yes,No,还有各种图标，仅IE下有效．

3.限制上传文件类型为jpg.

4.限制离开当前页面，在离开时提示．仅限制窗口关闭或通过某个href超级链接离开．(页面刷新和地址栏改变时不提示）

demo.html如下：

<html>
<header>
<title>Demo for Javascript</title>

                //清空 For IE
                if (!window.addEventListener)
                {
                    uploadfile.outerHTML += '';
                }
                else
                {

                   //其它
                    uploadfile.value = '';
                }

              hd.value = '';
          }
      }
  }

  //实现vbs调用，IE有效
  function testconfirm()
  {
    var flag=false;
    var strmsg='Does this Requirement still need to be filled?';
    if(top.execScript!=null)
      {
          flag=vbsconfirm(strmsg)
      }
      else
      {
           flag=window.confirm(strmsg);
      }
      alert(flag);
  }

  //调用vbs对话框?
  function vbsconfirm(str)
  {
      execScript("n=msgbox('" + str + "', vbYesNo+vbQuestion,'Confirmation')", "vbscript");
      return (n == 6);
  }

//限制用户离开
   window.onbeforeunload = function()
   {
        var hdfConfirm = document.getElementById('hdexitpage');

    //用户当前窗口时提示，刷新不提示
        if( (event.clientX > document.body.clientWidth && event.clientY < 0 || event.altKey)
      || hdfConfirm.value.length > 0)
    {
            hdfConfirm.value = '';
            return 'Confirm Exit Page?';
        }
        hdfConfirm.value = '';
    }

    //设置限制标记
    function setExitFlag()
    {
        var hdfConfirm = document.getElementById('hdexitpage');
        if (hdfConfirm.value.length == 0)
        {
            hdfConfirm.value = '1';
        }
    }

  </script>


</header>

<body>

  <input type="file" id="uploadfile" width="550px" onBlur="checktype(this)" size="50" οnchange="checktype(this)"/>
  <input type="hidden" id="hdfileerror" />
  <input type="button" value="test confirm" οnclick="testconfirm();" />

  <a href="demo.html" id="linkconfirm" title="open other page" Target="_blank" οnclick="testconfirm();" >test</a>

  <input type="button" value="Enable Link" οnclick="EnabledLink(true);" />
  <input type="button" value="Disable Link" οnclick="EnabledLink(false);" />

  <a href="demo2.html" id="linkconfirm" title="can exit page" >can exit page</a>
  <a href="demo3.html" id="linkconfirm" title="not exit page" οnclick="setExitFlag();" >not exit page</a>
  <input type="hidden" id="hdexitpage" />

</body>
</html>