在JS中ReadOnly属性比较奇怪，直接创建一个对象，给该对象赋值readonly属性不能够向HTML中一样使用下面的方式：
var
x
=
document.createElement(
"
input
"
);
x.type
=
"
text
"
;
x.value
=
"
ttttt
"
;
x.id
=
"
xy
"
;
x.readonly
=
"
readonly
"
;
这样创建的对象并不是只读的。正确的写法是:
var
x
=
document.createElement(
"
input
"
);
x.type
=
"
text
"
;
x.value
=
"
ttttt
"
;
x.id
=
"
xy
"
;
x.readOnly
=
true
;
这个平时写JS时候要注意。
var
x
=
document.createElement(
"
input
"
);x.type
=
"
text
"
;x.value
=
"
ttttt
"
;x.id
=
"
xy
"
;x.readonly
=
"
readonly
"
;
var
x
=
document.createElement(
"
input
"
);x.type
=
"
text
"
;x.value
=
"
ttttt
"
;x.id
=
"
xy
"
;x.readOnly
=
true
;
