JS限制操作

编写网站的时候会有一些特殊的需求，比如说增加亿点点限制，

打开控制面板开启调试 强制进入调试模式debugger;

禁用访问者进行粘贴复制等一些操作

以下是代码：

    const handler = setInterval(function () { 
        console.clear(); 
        const before = new Date(); 
        debugger; 
        const after = new Date(); 
        const cost = after.getTime() - before.getTime(); 
        if (cost > 100)  
      }, 1);

    
    //屏蔽右键菜单
    document.oncontextmenu = function (event) {
      if (window.event) {
        event = window.event;
      }
      try {
        var the = event.srcElement;
        if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")) {
          return false;
        }
        return true;
      } catch (e) {
        return false;
      }
    }
    //屏蔽粘贴
    document.onpaste = function (event) {
      if (window.event) {
        event = window.event;
      }
      try {
        var the = event.srcElement;
        if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")) {
          return false;
        }
        return true;
      } catch (e) {
        return false;
      }
    }
    //屏蔽复制

    //屏蔽剪切
    document.oncut = function (event) {
      if (window.event) {
        event = window.event;
      }
      try {
        var the = event.srcElement;
        if (!((the.tagName == "INPUT" && the.type.toLowerCase() == "text") || the.tagName == "TEXTAREA")) {
          return false;
        }
        return true;
      } catch (e) {
        return false;
      }
    }
    //禁止f12

    function fuckyou() {
      window.open("https://ruancang.net", "_blank"); //新窗口打开页面
      window.close(); //关闭当前窗口(防抽)
      window.location = "about:blank"; //将当前窗口跳转置空白页
    }
    //禁止Ctrl+U
    var arr = [123, 17, 18];
    document.oncontextmenu = new Function("event.returnValue=false;"), //禁用右键

      window.onkeydown = function (e) {
        var keyCode = e.keyCode || e.which || e.charCode;
        var ctrlKey = e.ctrlKey || e.metaKey;
        console.log(keyCode + "--" + keyCode);
        if (ctrlKey && keyCode == 85) {
          e.preventDefault();
        }
        if (arr.indexOf(keyCode) > -1) {
          e.preventDefault();
        }
      }

    function ck() {
      console.profile();
      console.profileEnd();
      //我们判断一下profiles里面有没有东西，如果有，肯定有人按F12了，没错！！
      if (console.clear) {
        console.clear()
      };
      if (typeof console.profiles == "object") {
        return console.profiles.length > 0;
      }
    }

    function hehe() {
      if ((window.console && (console.firebug || console.table && /firebug/i.test(console.table()))) || (
        typeof opera ==
        'object' && typeof opera.postError == 'function' && console.profile.length > 0)) {
        fuckyou();
      }
      if (typeof console.profiles == "object" && console.profiles.length > 0) {
        fuckyou();
      }
    }
    hehe();
    window.onresize = function () {
      if ((window.outerHeight - window.innerHeight) > 100)
        //判断当前窗口内页高度和窗口高度，如果差值大于100，那么呵呵
        fuckyou();
    }

    document.onkeydown = function (event) {
      if ((event.keyCode == 112) || //屏蔽 F1
        (event.keyCode == 113) || //屏蔽 F2
        (event.keyCode == 114) || //屏蔽 F3
        (event.keyCode == 115) || //屏蔽 F4
        // (event.keyCode == 116) || //屏蔽 F5
        (event.keyCode == 117) || //屏蔽 F6
        (event.keyCode == 118) || //屏蔽 F7
        (event.keyCode == 119) || //屏蔽 F8
        (event.keyCode == 120) || //屏蔽 F9
        (event.keyCode == 121) || //屏蔽 F10
        (event.keyCode == 122) || //屏蔽 F11
        (event.keyCode == 123)) //屏蔽 F12
      {
        return false;
      }
    }
    window.onhelp = function () {
      return false;
    }