form anything

form

form fields event note

• when the checked state of an input:checkbox or input:radio element is modified, the CHECKED property is changed
• when the contents of an input:text or textarea element are modified, the value property is changed
• when the selection in a select element is modified, the selectedIndex property is changed.

submit 触发

input type="submit"
input type="image"
button type 不等于button时
默认点击就提交表单

form.id(IE67)

• form.id(如果id为submit，则报错Uncaught TypeError: object is not a function）当元素id也是submit时，form.id取到的是这个元素；
  或
• form 里面的id.submit/id.function() 报错，因为IE里id直接取到这个表单元素。
• 当dom的id和表单的name属性相同时，getElementById会匹配到同名的form。When using getElementById to get a reference to an element via the id attribute, Internet Explorer for Windows (and some versions of Opera) will also match an element whose name attribute contains the same value.