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The method for JavaScript to obtain and modify value is to use the value attribute to modify its value. The code is [var a=document.getElementById("hello");].
The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.
javascript Get the method of modifying value:
Some elements have value attributes, such as input, bottom, select, etc. You can use the value attribute to modify its value.
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>修改value</title> </head> <body> <input type="text" name="hello" value="Hello krray" id="hello"> <script> var a=document.getElementById("hello"); alert( a.value); a.value="你好,小凯" </script> </body> </html>
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