script部分 全部代码 效果
function add(clickNum){ document.getElementById("screen").value += clickNum.value; }/*向屏幕增加数据*/ function getResult(){ var str = document.getElementById("screen").value; var ope,num1,num2; if((ope = str.indexOf("+"))!=-1){ num1 = parseFloat(str.substring(0,ope)); num2 = parseFloat(str.substring(ope+1)); document.getElementById("screen").value = num1 + num2; }else if((ope = str.indexOf("-"))!=-1){ num1 = parseFloat(str.substring(0,ope)); num2 = parseFloat(str.substring(ope+1)); document.getElementById("screen").value = num1 - num2; }else if((ope = str.indexOf("*"))!=-1){ num1 = parseFloat(str.substring(0,ope)); num2 = parseFloat(str.substring(ope+1)); document.getElementById("screen").value = num1 * num2; }else if((ope = str.indexOf("/"))!=-1){ num1 = parseFloat(str.substring(0,ope)); num2 = parseFloat(str.substring(ope+1)); document.getElementById("screen").value = num1 / num2; } }/*根据符号进行判断计算*/ function clears(){ document.getElementById("screen").value = ""; }/*清除函数*/ <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>网页计算器</title> <style type="text/css"> table input{ width:50px; height:50px; }/*设置按钮格式*/ #screen{ width:150px; height:45px; }/*设置屏幕格式*/ table { border:1px solid #d0d0d0; } </style> <script type="text/javascript"> function add(clickNum){ document.getElementById("screen").value += clickNum.value; }/*向屏幕增加数据*/ function getResult(){ var str = document.getElementById("screen").value; var ope,num1,num2; if((ope = str.indexOf("+"))!=-1){ num1 = parseFloat(str.substring(0,ope)); num2 = parseFloat(str.substring(ope+1)); document.getElementById("screen").value = num1 + num2; }else if((ope = str.indexOf("-"))!=-1){ num1 = parseFloat(str.substring(0,ope)); num2 = parseFloat(str.substring(ope+1)); document.getElementById("screen").value = num1 - num2; }else if((ope = str.indexOf("*"))!=-1){ num1 = parseFloat(str.substring(0,ope)); num2 = parseFloat(str.substring(ope+1)); document.getElementById("screen").value = num1 * num2; }else if((ope = str.indexOf("/"))!=-1){ num1 = parseFloat(str.substring(0,ope)); num2 = parseFloat(str.substring(ope+1)); document.getElementById("screen").value = num1 / num2; } }/*根据符号进行判断计算*/ function clears(){ document.getElementById("screen").value = ""; }/*清除函数*/ </script> </head> <body> <table> <tr> <th colspan="3"><input type="text" id="screen"/></th> <th><input type="button" value="C" onclick="clears()"/></th> </tr> <tr> <th><input type="button" value="7" onclick="add(this)"/></th> <th><input type="button" value="8" onclick="add(this)"/></th> <th><input type="button" value="9" onclick="add(this)"/></th> <th><input type="button" value="/" onclick="add(this)"/></th> </tr> <tr> <th><input type="button" value="4" onclick="add(this)"/></th> <th><input type="button" value="5" onclick="add(this)"/></th> <th><input type="button" value="6" onclick="add(this)"/></th> <th><input type="button" value="*" onclick="add(this)"/></th> </tr> <tr> <th><input type="button" value="1" onclick="add(this)"/></th> <th><input type="button" value="2" onclick="add(this)"/></th> <th><input type="button" value="3" onclick="add(this)"/></th> <th><input type="button" value="-" onclick="add(this)"/></th> </tr> <tr> <th><input type="button" value="0" onclick="add(this)"/></th> <th><input type="button" value="." onclick="add(this)"/></th> <th><input type="button" value="=" onclick="getResult()"/></th> <th><input type="button" value="+" onclick="add(this)"/></th> </tr> </table> </body> </html>
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