20171020.01
来源:互联网 发布:膝盖骨刺用什么药 知乎 编辑:程序博客网 时间:2024/06/03 17:34
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>Document</title></head><body> <input type="text" id="num1"> <input type="text" id="num2"> <input type="button" value="相加" id="add"> <span id="result"></span><script> /* */ console.log(1+1);//加法运算 console.log("1"+1); console.log("1"+1+1);//字符串拼接:如果有一边为字符串,也会把另外一边转化为字符串,做字符串拼接. var num1 = document.getElementById('num1') var num2 = document.getElementById('num2') var add = document.getElementById('add') var result = document.getElementById('result') add.onclick = function (){ result.innerHTML = num1.value + num2.value ;//一律不是数字,是字符串. }</script> </body></html>
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