標籤：js
需求和代碼如下：
“這是My Code：”
1: <input type="text" id="price2" value="333"/>
2: <input type="text" id="trueprice" value="" />
3:
4:
5: <script type="text/javascript">
6: document.getElementById("price2").onkeyup = function() {
7: document.getElementById("trueprice").value = this.value;
8: }
9: </script>
問題：現在開啟這個頁面，trueprice的值預設是空的，怎樣才能實現預設開啟這個頁面trueprice就已經和price2一樣了呢？（price2是一個動態數值）
<input type=”text” id=”trueprice” value=”” />是固定不可以修改的
我的一個簡單實現：
1: <!DOCTYPE HTML>
2: <html>
3: <head>
4: <meta http-equiv="content-type" content="text/html;charset=utf-8">
5: <title>Test</title>
6: </head>
7: <body>
8: <input type="text" id="price2" value="333" onkeyup="test(this.value);"/>
9: <input type="text" id="trueprice" value="" />
10: <script type="text/javascript">
11: var price2 = document.getElementById("price2").value;
12: document.getElementById("trueprice").value = price2;
13: function test (defaultVal) {
14: document.getElementById("trueprice").value = defaultVal;
15: }
16: </script>
17:
18: </body>
19: </html>
效果：
在第一個文字框中輸入的內容能同步到第二個文字框
若你有不同意見，歡迎交流。不足之處，敬請諒解。
來源：http://www.ido321.com/567.html
關於js中設定預設參數，可以戳此：http://www.ido321.com/555.html
問題：關於貼友一個用js傳遞value預設值的簡單實現
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