javascript新手语法小结

新手入学时常学到的东西~ <script language="javascript">alert('badwolf测试!');</script> //弹提示 <script language="javascript">alert('呵呵!');</script> //弹提示 <script language="javascript">alert(new Date());</script> //读系统时间 <a href="javascript:alert(new Date());">www.winshell.cn</a> //点连接运行js显示时间 <input type="button" onClick="alert(new Date())" value="点这里"> //点提交按钮运行js显示时间 ***********************for回圈*************************** <script> var badwolf_x=""; for(var x=1; x <= 100 ; x++) { badwolf_x=badwolf_x+"x="+x; } alert(badwolf_x); </script> ***********************计算器***************************** <script> function get_sum() { var x=parseFloat(document.jisuanqi.no1.value); var y=parseFloat(document.jisuanqi.no2.value); var sum=x+y; alert(sum); // return sum; } </script> <form name="jisuanqi" action="#" > <input type="text" name="no1" value="请输入第一个数"> <lable>+</lable> <input type="text" name="no2" value="请输入第二个数"> <input type="button" value="计算" onclick="get_sum()"> </form> ***********************if/else根据成绩显示评语*************** <html> <head> <title>if/else根据成绩显示评语</title> </head> <script> function dd() { var aa=document.form1.chengji.value; if(aa<=100 && aa>90) { alert("成绩优秀"); } else if(aa<=90 && aa>75) { alert("成绩中等"); } else if(aa<=75 && aa>=60) { alert("及格"); } else if(aa<60 && aa>=0) { alert("不及格"); } else { alert("你傻啊～～～！！你输入的是成绩么？？？？"); } } </script> <body> <form name="form1" action="#"> <lable>请输入你的成绩<lable><input type="text" name="chengji"><input type="button" value="获得评语！！" onclick="dd()"> </form> </body> </html> ***********************if3*************** <script> var x=10; var y=-4; if(x>20) { if(y>0) { alert(x+y); } else { alert(x-y); } } else { alert('猪'); } </script>

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