JavaScript syntax summary for newbies_basic knowledge

Things that novices often learn when enrolling~

// Pop-up prompt

// Pop-up prompt // Read the system time
www.winshell.cn
//Click the link to run js to display the time

//Click the submit button to run the js to display the time
************************ **for loop****************************

****** *******************Calculator****************************

**** *********************if/elseDisplay comments based on scores***************


if/else display comments based on scores

Please Enter your results



<script>alert('badwolf测试!');</script> <script>alert('呵呵!');</script><script>alert(new Date());</script> <script> <BR> var badwolf_x=""; <BR> for(var x=1; x <= 100 ; x++) <BR> { <BR> badwolf_x=badwolf_x+"x="+x; <BR> } <BR> alert(badwolf_x); <BR></script>****************** *******if3**************** <script> <BR> function get_sum() <BR> { <BR> var x=parseFloat(document.jisuanqi.no1.value); <BR> var y=parseFloat(document.jisuanqi.no2.value); <BR> var sum=x+y; <BR> alert(sum); <BR> // return sum; <BR> } <BR></script><script> <BR> function dd() <BR> { <BR> var aa=document.form1.chengji.value; <BR> if(aa<=100 && aa>90) <BR> { <BR> alert("成绩优秀"); <BR> } <BR> else if(aa<=90 && aa>75) <BR> { <BR> alert("成绩中等"); <BR> } <BR> else if(aa<=75 && aa>=60) <BR> { <BR> alert("及格"); <BR> } <BR> else if(aa<60 && aa>=0) <BR> { <BR> alert("不及格"); <BR> } <BR> else <BR> { <BR> alert("你傻啊～～～！！你输入的是成绩么？？？？"); <BR> } <BR> } <BR> </script> <script> <BR> var x=10; <BR> var y=-4; <BR> if(x>20) <BR> { <BR> if(y>0) <BR> { <BR> alert(x+y); <BR> } <BR> else <BR> { <BR> alert(x-y); <BR> } <BR> } <BR> else <BR> { <BR> alert('猪'); <BR> } <BR></script>