JS错误记录

        window.onload = function () {
            var oDiv = document.getElementById('div1');
            var oBtn = document.getElementById('btn1');

            //oBtn.onclick = function () {
            oBtn.onclick = function (ev) {     
           // (ev)是事件的参数。函数里有 oEvent这个变量，所以function () 括号内要写参数。
                var oEvent = ev || event;

                oDiv.style.display = 'block';

                oEvent.cancelBubble = true;

            };
            document.onclick = function () {

                oDiv.style.display = 'none';
            }
        }

window.onload = function () {
        var oTxt1 = document.getElementById('txt1');
        var oTxt2 = document.getElementById('txt2');
        var oBtn = document.getElementById('btn1');

        oBtn.onclick = function(){
            oTxt2.value += oTxt1.value + '
';  //   符号是反向的，和注释相反的那个。
            // oTxt2.value = oTxt1.value + oTxt2.value;
            oTxt1.value = '';
        };

        document.onkeydown = function(ev){
            var oEvent = ev || event;

            if(oEvent.keyCode==13)  //keycode  keyCode  C大写
            //if(oEvent.keyCode==13 && oEvent.ctrlKey)  // ctrl+Enter
            {
                oTxt2.value += oTxt1.value + '
';
                oTxt1.value = '';
            }
        }
    }