2015-03-2419:51:46
//第一种方法：<!doctype html><html lang="en"><head><meta charset="UTF-8"><meta name="Generator" content="EditPlus®"><meta name="Author" content=""><meta name="KeyWords" content=""><meta name="Description" content=""><title>实现100以内自然数求和</title></head><script language='Javascript'>//实现100以内自然数求和，网页预览效果如图var i=1,sum=0; //声明变量i和sum;while(i<=100){sum+=i;i++}document.write('1+2+3+...+100='+sum);//向页面中输入结果</script><body></body></html> //第二种方法：<!doctype html><html lang="en"><head><meta charset="UTF-8"><meta name="Generator" content="EditPlus®"><meta name="Author" content=""><meta name="Keywords" content=""><meta name="Description" content=""><title>100以内自然数求和</title></head><script>var sum=0;for(var i=1;i<=100;i++){sum+=i;}document.write('1+2+3+...+100='+sum);</script><body></body></html> //第三种方法： <!doctype html><html lang="en"><head><meta charset="UTF-8"><meta name="Generator" content="EditPlus®"><meta name="Author" content=""><meta name="Keywords" content=""><meta name="Description" content=""><title>100以内自然数求和</title> <script>var i=1,sum=0;do{sum+=i;i++}while(i<=100){document.write('1+2+3+...+100='+sum);}</script></head><body></body></html>
个人喜好比较喜欢用for循环，感觉for的逻辑比较符合思维方式
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