public StrBuilder insert(int index, Object obj) {
		if (obj instanceof CharSequence) {
			return insert(index, (CharSequence) obj);
		}
		return insert(index, Convert.toStr(obj));
	}
@Test
	public void insertTest() {
		StrBuilder builder = StrBuilder.create(1);
		builder.append("aaa").append("你好").append('r');
		builder.insert(3, "数据插入");
		assertEquals("aaa数据插入你好r", builder.toString());
	}