<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <div id="div1"></div> <div id="div2"></div> <div id="div3"></div> <script> /* * 用 三种循环语句写出九九乘法表 * for; while do ;do while; * */ /* * 方法一 * */ var oDiv1=document.getElementById('div1'); for (var nFirstNum1 = 1; nFirstNum1 < 10; nFirstNum1++) { for (var nSecNum1 = 1; nSecNum1 <= nFirstNum1; nSecNum1++) { oDiv1.innerHTML+=nFirstNum1+'*'+nSecNum1+'='+nFirstNum1*nSecNum1+' '; } oDiv1.innerHTML+="<br/>"; }
/* * 方法二 * */ var oDiv2=document.getElementById('div2'); var nFirstNum2=1; while(nFirstNum2<10){ var nSecNum2=1; while(nSecNum2<=nFirstNum2){ oDiv2.innerHTML+=nFirstNum2+'*'+nSecNum2+'='+nFirstNum2*nSecNum2+' '; nSecNum2++; } oDiv2.innerHTML+="<br/>"; nFirstNum2++; }
/* * 方法三 * */ var oDiv3=document.getElementById('div3'); var nFirstNum3=1; do{ var nSecNum3=1; do{ oDiv3.innerHTML+=nFirstNum3+'*'+nSecNum3+'='+nFirstNum3*nSecNum3+' '; nSecNum3++; }while(nSecNum3<=nFirstNum3) oDiv3.innerHTML+="<br/>"; nFirstNum3++; }while(nFirstNum3<10) </script>
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