W3School TIY Editor
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<html> <head> <script type="text/javascript"> function makeCheck(thisForm) { for (i = 0; i < thisForm.option.length; i++) { thisForm.option[i].checked=true } } function makeUncheck(thisForm) { for (i = 0; i < thisForm.option.length; i++) { thisForm.option[i].checked=false } } </script> </head> <body> <form name="myForm"> <input type="button" value="选取" onclick="makeCheck(this.form)"> <input type="button" value="取消" onclick="makeUncheck(this.form)"> <br /> <input type="checkbox" name="option">苹果<br /> <input type="checkbox" name="option">桔子<br /> <input type="checkbox" name="option">香蕉<br /> <input type="checkbox" name="option">西瓜 </form> </body> </html>