<script type="text/javascript">function Sum(arg1,arg2){ //數(shù)值加法函數(shù)var sarg1 = new String(arg1); //將傳入的參數(shù)轉(zhuǎn)為字符串以便進(jìn)行參數(shù)檢查var sarg2 = new String(arg2); //將參數(shù)2轉(zhuǎn)為字符類型if( (sarg1=="")||(sarg2=="") ) //確保參數(shù)不為空{(diào)var e0 = new Error(); //當(dāng)有參數(shù)為空則拋出異常e0.Serial = 1000001; //錯(cuò)誤編號(hào)if( sarg1=="" ) //根據(jù)為空的參數(shù)正確填寫錯(cuò)誤信息{e0.message = "Sum函數(shù)參數(shù)非法：第1個(gè)參數(shù)為空！"; //錯(cuò)誤描述信息}else{e0.message = "Sum函數(shù)參數(shù)非法：第2個(gè)參數(shù)為空！";}throw e0; //拋出錯(cuò)誤信息}for(i=0;i<sarg1.length;i++){ //參數(shù)合法性檢查for(j=0;j<10;j++){ //檢查所有字符if(sarg1.charAt(i)==j) //若不是數(shù)字則拋出錯(cuò)誤信息{break; //跳出循環(huán)}else{if(j==9) //當(dāng)已經(jīng)查詢到數(shù)字9時(shí){var e1 = new Error(); //錯(cuò)誤信息對(duì)象e1.Serial = 1000001; //錯(cuò)誤編號(hào)e1.message = "Sum函數(shù)參數(shù)：" + sarg1 + "是非法數(shù)字！"; //錯(cuò)誤描述信息throw e1;}}}}for( k=0;k<sarg2.length;k++ ) //檢查參數(shù)2是數(shù)字{for(l=0;l<10;l++){ //從0到9逐一比較if(sarg2.charAt(k)==l) //如果是0~9的數(shù)字{break;}else{if(l==9) //只有包含非數(shù)字則拋出錯(cuò)誤信息{var e2 = new Error(); //創(chuàng)建錯(cuò)誤對(duì)象e2.Serial = 1000001; //異常編號(hào)e2.message = "Sum函數(shù)參數(shù)：" + sarg2 + "是非法數(shù)字！";throw e2;}}}}return Number(arg1) + Number(arg2); //參數(shù)都正確則返回兩個(gè)值得和} function Button1_onclick(){ //“計(jì)算”按鈕的單機(jī)事件處理程序try{var Text1 = document.getElementById("Text1");var Text2 = document.getElementById("Text2");var Text3 = document.getElementById("Text3");var sum = Sum(Text1.value,Text2.value); //調(diào)用函數(shù)進(jìn)行計(jì)算Text3.value = sum; //輸出計(jì)算結(jié)果}catch(e){ //有錯(cuò)誤發(fā)生則輸出錯(cuò)誤信息alert(e.message); //輸出異常中的信息if(e.Serail == 1000001) //如果是1000001號(hào)錯(cuò)誤{alert(e.message); e = null;}}}</script>

<input type="text" id="Text1" style="width:84px" maxlength="20"/>+<input type="text" id="Text2" style="width:75px" maxlength="20"/>=<input type="text" id="Text3" style="width:69px"><input type="button" id="Button1" value="計(jì)算" onclick="return Button1_onclick()" />